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 struct rtnl_msg_handler {
33 struct module *owner;
34 int protocol;
35 int msgtype;
36 rtnl_doit_func doit;
37 rtnl_dumpit_func dumpit;
38 int flags;
39 };
40
41 void rtnl_register(int protocol, int msgtype,
42 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
43 int rtnl_register_module(struct module *owner, int protocol, int msgtype,
44 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
45 int rtnl_unregister(int protocol, int msgtype);
46 void rtnl_unregister_all(int protocol);
47
48 int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n);
49 void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n);
50
51 #define rtnl_register_many(handlers) \
52 __rtnl_register_many(handlers, ARRAY_SIZE(handlers))
53 #define rtnl_unregister_many(handlers) \
54 __rtnl_unregister_many(handlers, ARRAY_SIZE(handlers))
55
rtnl_msg_family(const struct nlmsghdr * nlh)56 static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
57 {
58 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
59 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
60 else
61 return AF_UNSPEC;
62 }
63
64 /**
65 * struct rtnl_link_ops - rtnetlink link operations
66 *
67 * @list: Used internally
68 * @kind: Identifier
69 * @netns_refund: Physical device, move to init_net on netns exit
70 * @maxtype: Highest device specific netlink attribute number
71 * @policy: Netlink policy for device specific attribute validation
72 * @validate: Optional validation function for netlink/changelink parameters
73 * @alloc: netdev allocation function, can be %NULL and is then used
74 * in place of alloc_netdev_mqs(), in this case @priv_size
75 * and @setup are unused. Returns a netdev or ERR_PTR().
76 * @priv_size: sizeof net_device private space
77 * @setup: net_device setup function
78 * @newlink: Function for configuring and registering a new device
79 * @changelink: Function for changing parameters of an existing device
80 * @dellink: Function to remove a device
81 * @get_size: Function to calculate required room for dumping device
82 * specific netlink attributes
83 * @fill_info: Function to dump device specific netlink attributes
84 * @get_xstats_size: Function to calculate required room for dumping device
85 * specific statistics
86 * @fill_xstats: Function to dump device specific statistics
87 * @get_num_tx_queues: Function to determine number of transmit queues
88 * to create when creating a new device.
89 * @get_num_rx_queues: Function to determine number of receive queues
90 * to create when creating a new device.
91 * @get_link_net: Function to get the i/o netns of the device
92 * @get_linkxstats_size: Function to calculate the required room for
93 * dumping device-specific extended link stats
94 * @fill_linkxstats: Function to dump device-specific extended link stats
95 */
96 struct rtnl_link_ops {
97 struct list_head list;
98
99 const char *kind;
100
101 size_t priv_size;
102 struct net_device *(*alloc)(struct nlattr *tb[],
103 const char *ifname,
104 unsigned char name_assign_type,
105 unsigned int num_tx_queues,
106 unsigned int num_rx_queues);
107 void (*setup)(struct net_device *dev);
108
109 bool netns_refund;
110 unsigned int maxtype;
111 const struct nla_policy *policy;
112 int (*validate)(struct nlattr *tb[],
113 struct nlattr *data[],
114 struct netlink_ext_ack *extack);
115
116 int (*newlink)(struct net *src_net,
117 struct net_device *dev,
118 struct nlattr *tb[],
119 struct nlattr *data[],
120 struct netlink_ext_ack *extack);
121 int (*changelink)(struct net_device *dev,
122 struct nlattr *tb[],
123 struct nlattr *data[],
124 struct netlink_ext_ack *extack);
125 void (*dellink)(struct net_device *dev,
126 struct list_head *head);
127
128 size_t (*get_size)(const struct net_device *dev);
129 int (*fill_info)(struct sk_buff *skb,
130 const struct net_device *dev);
131
132 size_t (*get_xstats_size)(const struct net_device *dev);
133 int (*fill_xstats)(struct sk_buff *skb,
134 const struct net_device *dev);
135 unsigned int (*get_num_tx_queues)(void);
136 unsigned int (*get_num_rx_queues)(void);
137
138 unsigned int slave_maxtype;
139 const struct nla_policy *slave_policy;
140 int (*slave_changelink)(struct net_device *dev,
141 struct net_device *slave_dev,
142 struct nlattr *tb[],
143 struct nlattr *data[],
144 struct netlink_ext_ack *extack);
145 size_t (*get_slave_size)(const struct net_device *dev,
146 const struct net_device *slave_dev);
147 int (*fill_slave_info)(struct sk_buff *skb,
148 const struct net_device *dev,
149 const struct net_device *slave_dev);
150 struct net *(*get_link_net)(const struct net_device *dev);
151 size_t (*get_linkxstats_size)(const struct net_device *dev,
152 int attr);
153 int (*fill_linkxstats)(struct sk_buff *skb,
154 const struct net_device *dev,
155 int *prividx, int attr);
156 };
157
158 int __rtnl_link_register(struct rtnl_link_ops *ops);
159 void __rtnl_link_unregister(struct rtnl_link_ops *ops);
160
161 int rtnl_link_register(struct rtnl_link_ops *ops);
162 void rtnl_link_unregister(struct rtnl_link_ops *ops);
163
164 /**
165 * struct rtnl_af_ops - rtnetlink address family operations
166 *
167 * @list: Used internally
168 * @family: Address family
169 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family
170 * specific netlink attributes.
171 * @get_link_af_size: Function to calculate size of address family specific
172 * netlink attributes.
173 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
174 * for invalid configuration settings.
175 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
176 * net_device accordingly.
177 */
178 struct rtnl_af_ops {
179 struct list_head list;
180 int family;
181
182 int (*fill_link_af)(struct sk_buff *skb,
183 const struct net_device *dev,
184 u32 ext_filter_mask);
185 size_t (*get_link_af_size)(const struct net_device *dev,
186 u32 ext_filter_mask);
187
188 int (*validate_link_af)(const struct net_device *dev,
189 const struct nlattr *attr,
190 struct netlink_ext_ack *extack);
191 int (*set_link_af)(struct net_device *dev,
192 const struct nlattr *attr,
193 struct netlink_ext_ack *extack);
194 int (*fill_stats_af)(struct sk_buff *skb,
195 const struct net_device *dev);
196 size_t (*get_stats_af_size)(const struct net_device *dev);
197 };
198
199 void rtnl_af_register(struct rtnl_af_ops *ops);
200 void rtnl_af_unregister(struct rtnl_af_ops *ops);
201
202 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
203 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
204 unsigned char name_assign_type,
205 const struct rtnl_link_ops *ops,
206 struct nlattr *tb[],
207 struct netlink_ext_ack *extack);
208 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh);
209 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
210 u32 portid, const struct nlmsghdr *nlh);
211
212 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer,
213 struct netlink_ext_ack *exterr);
214 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid);
215
216 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
217
218 #endif
219