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 }; 17 18 enum 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 26 static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype) 27 { 28 return msgtype & RTNL_KIND_MASK; 29 } 30 31 struct rtnl_msg_handler { 32 struct module *owner; 33 int protocol; 34 int msgtype; 35 rtnl_doit_func doit; 36 rtnl_dumpit_func dumpit; 37 int flags; 38 }; 39 40 void rtnl_register(int protocol, int msgtype, 41 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 42 int rtnl_register_module(struct module *owner, int protocol, int msgtype, 43 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 44 int rtnl_unregister(int protocol, int msgtype); 45 void rtnl_unregister_all(int protocol); 46 47 int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n); 48 void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n); 49 50 #define rtnl_register_many(handlers) \ 51 __rtnl_register_many(handlers, ARRAY_SIZE(handlers)) 52 #define rtnl_unregister_many(handlers) \ 53 __rtnl_unregister_many(handlers, ARRAY_SIZE(handlers)) 54 55 static inline int rtnl_msg_family(const struct nlmsghdr *nlh) 56 { 57 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg)) 58 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family; 59 else 60 return AF_UNSPEC; 61 } 62 63 /** 64 * struct rtnl_link_ops - rtnetlink link operations 65 * 66 * @list: Used internally 67 * @kind: Identifier 68 * @netns_refund: Physical device, move to init_net on netns exit 69 * @maxtype: Highest device specific netlink attribute number 70 * @policy: Netlink policy for device specific attribute validation 71 * @validate: Optional validation function for netlink/changelink parameters 72 * @alloc: netdev allocation function, can be %NULL and is then used 73 * in place of alloc_netdev_mqs(), in this case @priv_size 74 * and @setup are unused. Returns a netdev or ERR_PTR(). 75 * @priv_size: sizeof net_device private space 76 * @setup: net_device setup function 77 * @newlink: Function for configuring and registering a new device 78 * @changelink: Function for changing parameters of an existing device 79 * @dellink: Function to remove a device 80 * @get_size: Function to calculate required room for dumping device 81 * specific netlink attributes 82 * @fill_info: Function to dump device specific netlink attributes 83 * @get_xstats_size: Function to calculate required room for dumping device 84 * specific statistics 85 * @fill_xstats: Function to dump device specific statistics 86 * @get_num_tx_queues: Function to determine number of transmit queues 87 * to create when creating a new device. 88 * @get_num_rx_queues: Function to determine number of receive queues 89 * to create when creating a new device. 90 * @get_link_net: Function to get the i/o netns of the device 91 * @get_linkxstats_size: Function to calculate the required room for 92 * dumping device-specific extended link stats 93 * @fill_linkxstats: Function to dump device-specific extended link stats 94 */ 95 struct rtnl_link_ops { 96 struct list_head list; 97 98 const char *kind; 99 100 size_t priv_size; 101 struct net_device *(*alloc)(struct nlattr *tb[], 102 const char *ifname, 103 unsigned char name_assign_type, 104 unsigned int num_tx_queues, 105 unsigned int num_rx_queues); 106 void (*setup)(struct net_device *dev); 107 108 bool netns_refund; 109 unsigned int maxtype; 110 const struct nla_policy *policy; 111 int (*validate)(struct nlattr *tb[], 112 struct nlattr *data[], 113 struct netlink_ext_ack *extack); 114 115 int (*newlink)(struct net *src_net, 116 struct net_device *dev, 117 struct nlattr *tb[], 118 struct nlattr *data[], 119 struct netlink_ext_ack *extack); 120 int (*changelink)(struct net_device *dev, 121 struct nlattr *tb[], 122 struct nlattr *data[], 123 struct netlink_ext_ack *extack); 124 void (*dellink)(struct net_device *dev, 125 struct list_head *head); 126 127 size_t (*get_size)(const struct net_device *dev); 128 int (*fill_info)(struct sk_buff *skb, 129 const struct net_device *dev); 130 131 size_t (*get_xstats_size)(const struct net_device *dev); 132 int (*fill_xstats)(struct sk_buff *skb, 133 const struct net_device *dev); 134 unsigned int (*get_num_tx_queues)(void); 135 unsigned int (*get_num_rx_queues)(void); 136 137 unsigned int slave_maxtype; 138 const struct nla_policy *slave_policy; 139 int (*slave_changelink)(struct net_device *dev, 140 struct net_device *slave_dev, 141 struct nlattr *tb[], 142 struct nlattr *data[], 143 struct netlink_ext_ack *extack); 144 size_t (*get_slave_size)(const struct net_device *dev, 145 const struct net_device *slave_dev); 146 int (*fill_slave_info)(struct sk_buff *skb, 147 const struct net_device *dev, 148 const struct net_device *slave_dev); 149 struct net *(*get_link_net)(const struct net_device *dev); 150 size_t (*get_linkxstats_size)(const struct net_device *dev, 151 int attr); 152 int (*fill_linkxstats)(struct sk_buff *skb, 153 const struct net_device *dev, 154 int *prividx, int attr); 155 }; 156 157 int __rtnl_link_register(struct rtnl_link_ops *ops); 158 void __rtnl_link_unregister(struct rtnl_link_ops *ops); 159 160 int rtnl_link_register(struct rtnl_link_ops *ops); 161 void rtnl_link_unregister(struct rtnl_link_ops *ops); 162 163 /** 164 * struct rtnl_af_ops - rtnetlink address family operations 165 * 166 * @list: Used internally 167 * @family: Address family 168 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family 169 * specific netlink attributes. 170 * @get_link_af_size: Function to calculate size of address family specific 171 * netlink attributes. 172 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr 173 * for invalid configuration settings. 174 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify 175 * net_device accordingly. 176 */ 177 struct rtnl_af_ops { 178 struct list_head list; 179 int family; 180 181 int (*fill_link_af)(struct sk_buff *skb, 182 const struct net_device *dev, 183 u32 ext_filter_mask); 184 size_t (*get_link_af_size)(const struct net_device *dev, 185 u32 ext_filter_mask); 186 187 int (*validate_link_af)(const struct net_device *dev, 188 const struct nlattr *attr, 189 struct netlink_ext_ack *extack); 190 int (*set_link_af)(struct net_device *dev, 191 const struct nlattr *attr, 192 struct netlink_ext_ack *extack); 193 int (*fill_stats_af)(struct sk_buff *skb, 194 const struct net_device *dev); 195 size_t (*get_stats_af_size)(const struct net_device *dev); 196 }; 197 198 void rtnl_af_register(struct rtnl_af_ops *ops); 199 void rtnl_af_unregister(struct rtnl_af_ops *ops); 200 201 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]); 202 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 203 unsigned char name_assign_type, 204 const struct rtnl_link_ops *ops, 205 struct nlattr *tb[], 206 struct netlink_ext_ack *extack); 207 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh); 208 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm, 209 u32 portid, const struct nlmsghdr *nlh); 210 211 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer, 212 struct netlink_ext_ack *exterr); 213 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid); 214 215 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind) 216 217 #endif 218