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