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 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