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