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 RTNL_FLAG_DUMP_UNLOCKED = BIT(2), 16 RTNL_FLAG_DUMP_SPLIT_NLM_DONE = BIT(3), /* legacy behavior */ 17 }; 18 19 enum rtnl_kinds { 20 RTNL_KIND_NEW, 21 RTNL_KIND_DEL, 22 RTNL_KIND_GET, 23 RTNL_KIND_SET 24 }; 25 #define RTNL_KIND_MASK 0x3 26 27 static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype) 28 { 29 return msgtype & RTNL_KIND_MASK; 30 } 31 32 void rtnl_register(int protocol, int msgtype, 33 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 34 int rtnl_register_module(struct module *owner, int protocol, int msgtype, 35 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 36 int rtnl_unregister(int protocol, int msgtype); 37 void rtnl_unregister_all(int protocol); 38 39 static inline int rtnl_msg_family(const struct nlmsghdr *nlh) 40 { 41 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg)) 42 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family; 43 else 44 return AF_UNSPEC; 45 } 46 47 /** 48 * struct rtnl_link_ops - rtnetlink link operations 49 * 50 * @list: Used internally 51 * @kind: Identifier 52 * @netns_refund: Physical device, move to init_net on netns exit 53 * @maxtype: Highest device specific netlink attribute number 54 * @policy: Netlink policy for device specific attribute validation 55 * @validate: Optional validation function for netlink/changelink parameters 56 * @alloc: netdev allocation function, can be %NULL and is then used 57 * in place of alloc_netdev_mqs(), in this case @priv_size 58 * and @setup are unused. Returns a netdev or ERR_PTR(). 59 * @priv_size: sizeof net_device private space 60 * @setup: net_device setup function 61 * @newlink: Function for configuring and registering a new device 62 * @changelink: Function for changing parameters of an existing device 63 * @dellink: Function to remove a device 64 * @get_size: Function to calculate required room for dumping device 65 * specific netlink attributes 66 * @fill_info: Function to dump device specific netlink attributes 67 * @get_xstats_size: Function to calculate required room for dumping device 68 * specific statistics 69 * @fill_xstats: Function to dump device specific statistics 70 * @get_num_tx_queues: Function to determine number of transmit queues 71 * to create when creating a new device. 72 * @get_num_rx_queues: Function to determine number of receive queues 73 * to create when creating a new device. 74 * @get_link_net: Function to get the i/o netns of the device 75 * @get_linkxstats_size: Function to calculate the required room for 76 * dumping device-specific extended link stats 77 * @fill_linkxstats: Function to dump device-specific extended link stats 78 */ 79 struct rtnl_link_ops { 80 struct list_head list; 81 82 const char *kind; 83 84 size_t priv_size; 85 struct net_device *(*alloc)(struct nlattr *tb[], 86 const char *ifname, 87 unsigned char name_assign_type, 88 unsigned int num_tx_queues, 89 unsigned int num_rx_queues); 90 void (*setup)(struct net_device *dev); 91 92 bool netns_refund; 93 unsigned int maxtype; 94 const struct nla_policy *policy; 95 int (*validate)(struct nlattr *tb[], 96 struct nlattr *data[], 97 struct netlink_ext_ack *extack); 98 99 int (*newlink)(struct net *src_net, 100 struct net_device *dev, 101 struct nlattr *tb[], 102 struct nlattr *data[], 103 struct netlink_ext_ack *extack); 104 int (*changelink)(struct net_device *dev, 105 struct nlattr *tb[], 106 struct nlattr *data[], 107 struct netlink_ext_ack *extack); 108 void (*dellink)(struct net_device *dev, 109 struct list_head *head); 110 111 size_t (*get_size)(const struct net_device *dev); 112 int (*fill_info)(struct sk_buff *skb, 113 const struct net_device *dev); 114 115 size_t (*get_xstats_size)(const struct net_device *dev); 116 int (*fill_xstats)(struct sk_buff *skb, 117 const struct net_device *dev); 118 unsigned int (*get_num_tx_queues)(void); 119 unsigned int (*get_num_rx_queues)(void); 120 121 unsigned int slave_maxtype; 122 const struct nla_policy *slave_policy; 123 int (*slave_changelink)(struct net_device *dev, 124 struct net_device *slave_dev, 125 struct nlattr *tb[], 126 struct nlattr *data[], 127 struct netlink_ext_ack *extack); 128 size_t (*get_slave_size)(const struct net_device *dev, 129 const struct net_device *slave_dev); 130 int (*fill_slave_info)(struct sk_buff *skb, 131 const struct net_device *dev, 132 const struct net_device *slave_dev); 133 struct net *(*get_link_net)(const struct net_device *dev); 134 size_t (*get_linkxstats_size)(const struct net_device *dev, 135 int attr); 136 int (*fill_linkxstats)(struct sk_buff *skb, 137 const struct net_device *dev, 138 int *prividx, int attr); 139 }; 140 141 int __rtnl_link_register(struct rtnl_link_ops *ops); 142 void __rtnl_link_unregister(struct rtnl_link_ops *ops); 143 144 int rtnl_link_register(struct rtnl_link_ops *ops); 145 void rtnl_link_unregister(struct rtnl_link_ops *ops); 146 147 /** 148 * struct rtnl_af_ops - rtnetlink address family operations 149 * 150 * @list: Used internally 151 * @family: Address family 152 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family 153 * specific netlink attributes. 154 * @get_link_af_size: Function to calculate size of address family specific 155 * netlink attributes. 156 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr 157 * for invalid configuration settings. 158 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify 159 * net_device accordingly. 160 */ 161 struct rtnl_af_ops { 162 struct list_head list; 163 int family; 164 165 int (*fill_link_af)(struct sk_buff *skb, 166 const struct net_device *dev, 167 u32 ext_filter_mask); 168 size_t (*get_link_af_size)(const struct net_device *dev, 169 u32 ext_filter_mask); 170 171 int (*validate_link_af)(const struct net_device *dev, 172 const struct nlattr *attr, 173 struct netlink_ext_ack *extack); 174 int (*set_link_af)(struct net_device *dev, 175 const struct nlattr *attr, 176 struct netlink_ext_ack *extack); 177 int (*fill_stats_af)(struct sk_buff *skb, 178 const struct net_device *dev); 179 size_t (*get_stats_af_size)(const struct net_device *dev); 180 }; 181 182 void rtnl_af_register(struct rtnl_af_ops *ops); 183 void rtnl_af_unregister(struct rtnl_af_ops *ops); 184 185 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]); 186 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 187 unsigned char name_assign_type, 188 const struct rtnl_link_ops *ops, 189 struct nlattr *tb[], 190 struct netlink_ext_ack *extack); 191 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh); 192 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm, 193 u32 portid, const struct nlmsghdr *nlh); 194 195 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer, 196 struct netlink_ext_ack *exterr); 197 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid); 198 199 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind) 200 201 #endif 202