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 8typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *, 9 struct netlink_ext_ack *); 10typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *); 11 12enum 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}; 17 18enum rtnl_kinds { 19 RTNL_KIND_NEW, 20 RTNL_KIND_DEL, 21 RTNL_KIND_GET, 22 RTNL_KIND_SET 23}; 24#define RTNL_KIND_MASK 0x3 25 26static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype) 27{ 28 return msgtype & RTNL_KIND_MASK; 29} 30 31void rtnl_register(int protocol, int msgtype, 32 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 33int rtnl_register_module(struct module *owner, int protocol, int msgtype, 34 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 35int rtnl_unregister(int protocol, int msgtype); 36void rtnl_unregister_all(int protocol); 37 38static inline int rtnl_msg_family(const struct nlmsghdr *nlh) 39{ 40 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg)) 41 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family; 42 else 43 return AF_UNSPEC; 44} 45 46/** 47 * struct rtnl_link_ops - rtnetlink link operations 48 * 49 * @list: Used internally 50 * @kind: Identifier 51 * @netns_refund: Physical device, move to init_net on netns exit 52 * @maxtype: Highest device specific netlink attribute number 53 * @policy: Netlink policy for device specific attribute validation 54 * @validate: Optional validation function for netlink/changelink parameters 55 * @alloc: netdev allocation function, can be %NULL and is then used 56 * in place of alloc_netdev_mqs(), in this case @priv_size 57 * and @setup are unused. Returns a netdev or ERR_PTR(). 58 * @priv_size: sizeof net_device private space 59 * @setup: net_device setup function 60 * @newlink: Function for configuring and registering a new device 61 * @changelink: Function for changing parameters of an existing device 62 * @dellink: Function to remove a device 63 * @get_size: Function to calculate required room for dumping device 64 * specific netlink attributes 65 * @fill_info: Function to dump device specific netlink attributes 66 * @get_xstats_size: Function to calculate required room for dumping device 67 * specific statistics 68 * @fill_xstats: Function to dump device specific statistics 69 * @get_num_tx_queues: Function to determine number of transmit queues 70 * to create when creating a new device. 71 * @get_num_rx_queues: Function to determine number of receive queues 72 * to create when creating a new device. 73 * @get_link_net: Function to get the i/o netns of the device 74 * @get_linkxstats_size: Function to calculate the required room for 75 * dumping device-specific extended link stats 76 * @fill_linkxstats: Function to dump device-specific extended link stats 77 */ 78struct rtnl_link_ops { 79 struct list_head list; 80 81 const char *kind; 82 83 size_t priv_size; 84 struct net_device *(*alloc)(struct nlattr *tb[], 85 const char *ifname, 86 unsigned char name_assign_type, 87 unsigned int num_tx_queues, 88 unsigned int num_rx_queues); 89 void (*setup)(struct net_device *dev); 90 91 bool netns_refund; 92 unsigned int maxtype; 93 const struct nla_policy *policy; 94 int (*validate)(struct nlattr *tb[], 95 struct nlattr *data[], 96 struct netlink_ext_ack *extack); 97 98 int (*newlink)(struct net *src_net, 99 struct net_device *dev, 100 struct nlattr *tb[], 101 struct nlattr *data[], 102 struct netlink_ext_ack *extack); 103 int (*changelink)(struct net_device *dev, 104 struct nlattr *tb[], 105 struct nlattr *data[], 106 struct netlink_ext_ack *extack); 107 void (*dellink)(struct net_device *dev, 108 struct list_head *head); 109 110 size_t (*get_size)(const struct net_device *dev); 111 int (*fill_info)(struct sk_buff *skb, 112 const struct net_device *dev); 113 114 size_t (*get_xstats_size)(const struct net_device *dev); 115 int (*fill_xstats)(struct sk_buff *skb, 116 const struct net_device *dev); 117 unsigned int (*get_num_tx_queues)(void); 118 unsigned int (*get_num_rx_queues)(void); 119 120 unsigned int slave_maxtype; 121 const struct nla_policy *slave_policy; 122 int (*slave_changelink)(struct net_device *dev, 123 struct net_device *slave_dev, 124 struct nlattr *tb[], 125 struct nlattr *data[], 126 struct netlink_ext_ack *extack); 127 size_t (*get_slave_size)(const struct net_device *dev, 128 const struct net_device *slave_dev); 129 int (*fill_slave_info)(struct sk_buff *skb, 130 const struct net_device *dev, 131 const struct net_device *slave_dev); 132 struct net *(*get_link_net)(const struct net_device *dev); 133 size_t (*get_linkxstats_size)(const struct net_device *dev, 134 int attr); 135 int (*fill_linkxstats)(struct sk_buff *skb, 136 const struct net_device *dev, 137 int *prividx, int attr); 138}; 139 140int __rtnl_link_register(struct rtnl_link_ops *ops); 141void __rtnl_link_unregister(struct rtnl_link_ops *ops); 142 143int rtnl_link_register(struct rtnl_link_ops *ops); 144void rtnl_link_unregister(struct rtnl_link_ops *ops); 145 146/** 147 * struct rtnl_af_ops - rtnetlink address family operations 148 * 149 * @list: Used internally 150 * @family: Address family 151 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family 152 * specific netlink attributes. 153 * @get_link_af_size: Function to calculate size of address family specific 154 * netlink attributes. 155 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr 156 * for invalid configuration settings. 157 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify 158 * net_device accordingly. 159 */ 160struct rtnl_af_ops { 161 struct list_head list; 162 int family; 163 164 int (*fill_link_af)(struct sk_buff *skb, 165 const struct net_device *dev, 166 u32 ext_filter_mask); 167 size_t (*get_link_af_size)(const struct net_device *dev, 168 u32 ext_filter_mask); 169 170 int (*validate_link_af)(const struct net_device *dev, 171 const struct nlattr *attr, 172 struct netlink_ext_ack *extack); 173 int (*set_link_af)(struct net_device *dev, 174 const struct nlattr *attr, 175 struct netlink_ext_ack *extack); 176 int (*fill_stats_af)(struct sk_buff *skb, 177 const struct net_device *dev); 178 size_t (*get_stats_af_size)(const struct net_device *dev); 179}; 180 181void rtnl_af_register(struct rtnl_af_ops *ops); 182void rtnl_af_unregister(struct rtnl_af_ops *ops); 183 184struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]); 185struct net_device *rtnl_create_link(struct net *net, const char *ifname, 186 unsigned char name_assign_type, 187 const struct rtnl_link_ops *ops, 188 struct nlattr *tb[], 189 struct netlink_ext_ack *extack); 190int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh); 191int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm, 192 u32 portid, const struct nlmsghdr *nlh); 193 194int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer, 195 struct netlink_ext_ack *exterr); 196struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid); 197 198#define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind) 199 200#endif 201