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 * @alloc: netdev allocation function, can be %NULL and is then used 41 * in place of alloc_netdev_mqs(), in this case @priv_size 42 * and @setup are unused. Returns a netdev or ERR_PTR(). 43 * @priv_size: sizeof net_device private space 44 * @setup: net_device setup function 45 * @newlink: Function for configuring and registering a new device 46 * @changelink: Function for changing parameters of an existing device 47 * @dellink: Function to remove a device 48 * @get_size: Function to calculate required room for dumping device 49 * specific netlink attributes 50 * @fill_info: Function to dump device specific netlink attributes 51 * @get_xstats_size: Function to calculate required room for dumping device 52 * specific statistics 53 * @fill_xstats: Function to dump device specific statistics 54 * @get_num_tx_queues: Function to determine number of transmit queues 55 * to create when creating a new device. 56 * @get_num_rx_queues: Function to determine number of receive queues 57 * to create when creating a new device. 58 * @get_link_net: Function to get the i/o netns of the device 59 * @get_linkxstats_size: Function to calculate the required room for 60 * dumping device-specific extended link stats 61 * @fill_linkxstats: Function to dump device-specific extended link stats 62 */ 63 struct rtnl_link_ops { 64 struct list_head list; 65 66 const char *kind; 67 68 size_t priv_size; 69 struct net_device *(*alloc)(struct nlattr *tb[], 70 const char *ifname, 71 unsigned char name_assign_type, 72 unsigned int num_tx_queues, 73 unsigned int num_rx_queues); 74 void (*setup)(struct net_device *dev); 75 76 bool netns_refund; 77 unsigned int maxtype; 78 const struct nla_policy *policy; 79 int (*validate)(struct nlattr *tb[], 80 struct nlattr *data[], 81 struct netlink_ext_ack *extack); 82 83 int (*newlink)(struct net *src_net, 84 struct net_device *dev, 85 struct nlattr *tb[], 86 struct nlattr *data[], 87 struct netlink_ext_ack *extack); 88 int (*changelink)(struct net_device *dev, 89 struct nlattr *tb[], 90 struct nlattr *data[], 91 struct netlink_ext_ack *extack); 92 void (*dellink)(struct net_device *dev, 93 struct list_head *head); 94 95 size_t (*get_size)(const struct net_device *dev); 96 int (*fill_info)(struct sk_buff *skb, 97 const struct net_device *dev); 98 99 size_t (*get_xstats_size)(const struct net_device *dev); 100 int (*fill_xstats)(struct sk_buff *skb, 101 const struct net_device *dev); 102 unsigned int (*get_num_tx_queues)(void); 103 unsigned int (*get_num_rx_queues)(void); 104 105 unsigned int slave_maxtype; 106 const struct nla_policy *slave_policy; 107 int (*slave_changelink)(struct net_device *dev, 108 struct net_device *slave_dev, 109 struct nlattr *tb[], 110 struct nlattr *data[], 111 struct netlink_ext_ack *extack); 112 size_t (*get_slave_size)(const struct net_device *dev, 113 const struct net_device *slave_dev); 114 int (*fill_slave_info)(struct sk_buff *skb, 115 const struct net_device *dev, 116 const struct net_device *slave_dev); 117 struct net *(*get_link_net)(const struct net_device *dev); 118 size_t (*get_linkxstats_size)(const struct net_device *dev, 119 int attr); 120 int (*fill_linkxstats)(struct sk_buff *skb, 121 const struct net_device *dev, 122 int *prividx, int attr); 123 }; 124 125 int __rtnl_link_register(struct rtnl_link_ops *ops); 126 void __rtnl_link_unregister(struct rtnl_link_ops *ops); 127 128 int rtnl_link_register(struct rtnl_link_ops *ops); 129 void rtnl_link_unregister(struct rtnl_link_ops *ops); 130 131 /** 132 * struct rtnl_af_ops - rtnetlink address family operations 133 * 134 * @list: Used internally 135 * @family: Address family 136 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family 137 * specific netlink attributes. 138 * @get_link_af_size: Function to calculate size of address family specific 139 * netlink attributes. 140 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr 141 * for invalid configuration settings. 142 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify 143 * net_device accordingly. 144 */ 145 struct rtnl_af_ops { 146 struct list_head list; 147 int family; 148 149 int (*fill_link_af)(struct sk_buff *skb, 150 const struct net_device *dev, 151 u32 ext_filter_mask); 152 size_t (*get_link_af_size)(const struct net_device *dev, 153 u32 ext_filter_mask); 154 155 int (*validate_link_af)(const struct net_device *dev, 156 const struct nlattr *attr, 157 struct netlink_ext_ack *extack); 158 int (*set_link_af)(struct net_device *dev, 159 const struct nlattr *attr, 160 struct netlink_ext_ack *extack); 161 int (*fill_stats_af)(struct sk_buff *skb, 162 const struct net_device *dev); 163 size_t (*get_stats_af_size)(const struct net_device *dev); 164 }; 165 166 void rtnl_af_register(struct rtnl_af_ops *ops); 167 void rtnl_af_unregister(struct rtnl_af_ops *ops); 168 169 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]); 170 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 171 unsigned char name_assign_type, 172 const struct rtnl_link_ops *ops, 173 struct nlattr *tb[], 174 struct netlink_ext_ack *extack); 175 int rtnl_delete_link(struct net_device *dev); 176 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm); 177 178 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len, 179 struct netlink_ext_ack *exterr); 180 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid); 181 182 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind) 183 184 #endif 185