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 struct rtnl_msg_handler { 33 struct module *owner; 34 int protocol; 35 int msgtype; 36 rtnl_doit_func doit; 37 rtnl_dumpit_func dumpit; 38 int flags; 39 }; 40 41 void rtnl_register(int protocol, int msgtype, 42 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 43 int rtnl_register_module(struct module *owner, int protocol, int msgtype, 44 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags); 45 int rtnl_unregister(int protocol, int msgtype); 46 void rtnl_unregister_all(int protocol); 47 48 int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n); 49 void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n); 50 51 #define rtnl_register_many(handlers) \ 52 __rtnl_register_many(handlers, ARRAY_SIZE(handlers)) 53 #define rtnl_unregister_many(handlers) \ 54 __rtnl_unregister_many(handlers, ARRAY_SIZE(handlers)) 55 56 static inline int rtnl_msg_family(const struct nlmsghdr *nlh) 57 { 58 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg)) 59 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family; 60 else 61 return AF_UNSPEC; 62 } 63 64 /** 65 * struct rtnl_link_ops - rtnetlink link operations 66 * 67 * @list: Used internally 68 * @kind: Identifier 69 * @netns_refund: Physical device, move to init_net on netns exit 70 * @maxtype: Highest device specific netlink attribute number 71 * @policy: Netlink policy for device specific attribute validation 72 * @validate: Optional validation function for netlink/changelink parameters 73 * @alloc: netdev allocation function, can be %NULL and is then used 74 * in place of alloc_netdev_mqs(), in this case @priv_size 75 * and @setup are unused. Returns a netdev or ERR_PTR(). 76 * @priv_size: sizeof net_device private space 77 * @setup: net_device setup function 78 * @newlink: Function for configuring and registering a new device 79 * @changelink: Function for changing parameters of an existing device 80 * @dellink: Function to remove a device 81 * @get_size: Function to calculate required room for dumping device 82 * specific netlink attributes 83 * @fill_info: Function to dump device specific netlink attributes 84 * @get_xstats_size: Function to calculate required room for dumping device 85 * specific statistics 86 * @fill_xstats: Function to dump device specific statistics 87 * @get_num_tx_queues: Function to determine number of transmit queues 88 * to create when creating a new device. 89 * @get_num_rx_queues: Function to determine number of receive queues 90 * to create when creating a new device. 91 * @get_link_net: Function to get the i/o netns of the device 92 * @get_linkxstats_size: Function to calculate the required room for 93 * dumping device-specific extended link stats 94 * @fill_linkxstats: Function to dump device-specific extended link stats 95 */ 96 struct rtnl_link_ops { 97 struct list_head list; 98 99 const char *kind; 100 101 size_t priv_size; 102 struct net_device *(*alloc)(struct nlattr *tb[], 103 const char *ifname, 104 unsigned char name_assign_type, 105 unsigned int num_tx_queues, 106 unsigned int num_rx_queues); 107 void (*setup)(struct net_device *dev); 108 109 bool netns_refund; 110 unsigned int maxtype; 111 const struct nla_policy *policy; 112 int (*validate)(struct nlattr *tb[], 113 struct nlattr *data[], 114 struct netlink_ext_ack *extack); 115 116 int (*newlink)(struct net *src_net, 117 struct net_device *dev, 118 struct nlattr *tb[], 119 struct nlattr *data[], 120 struct netlink_ext_ack *extack); 121 int (*changelink)(struct net_device *dev, 122 struct nlattr *tb[], 123 struct nlattr *data[], 124 struct netlink_ext_ack *extack); 125 void (*dellink)(struct net_device *dev, 126 struct list_head *head); 127 128 size_t (*get_size)(const struct net_device *dev); 129 int (*fill_info)(struct sk_buff *skb, 130 const struct net_device *dev); 131 132 size_t (*get_xstats_size)(const struct net_device *dev); 133 int (*fill_xstats)(struct sk_buff *skb, 134 const struct net_device *dev); 135 unsigned int (*get_num_tx_queues)(void); 136 unsigned int (*get_num_rx_queues)(void); 137 138 unsigned int slave_maxtype; 139 const struct nla_policy *slave_policy; 140 int (*slave_changelink)(struct net_device *dev, 141 struct net_device *slave_dev, 142 struct nlattr *tb[], 143 struct nlattr *data[], 144 struct netlink_ext_ack *extack); 145 size_t (*get_slave_size)(const struct net_device *dev, 146 const struct net_device *slave_dev); 147 int (*fill_slave_info)(struct sk_buff *skb, 148 const struct net_device *dev, 149 const struct net_device *slave_dev); 150 struct net *(*get_link_net)(const struct net_device *dev); 151 size_t (*get_linkxstats_size)(const struct net_device *dev, 152 int attr); 153 int (*fill_linkxstats)(struct sk_buff *skb, 154 const struct net_device *dev, 155 int *prividx, int attr); 156 }; 157 158 int __rtnl_link_register(struct rtnl_link_ops *ops); 159 void __rtnl_link_unregister(struct rtnl_link_ops *ops); 160 161 int rtnl_link_register(struct rtnl_link_ops *ops); 162 void rtnl_link_unregister(struct rtnl_link_ops *ops); 163 164 /** 165 * struct rtnl_af_ops - rtnetlink address family operations 166 * 167 * @list: Used internally 168 * @family: Address family 169 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family 170 * specific netlink attributes. 171 * @get_link_af_size: Function to calculate size of address family specific 172 * netlink attributes. 173 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr 174 * for invalid configuration settings. 175 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify 176 * net_device accordingly. 177 */ 178 struct rtnl_af_ops { 179 struct list_head list; 180 int family; 181 182 int (*fill_link_af)(struct sk_buff *skb, 183 const struct net_device *dev, 184 u32 ext_filter_mask); 185 size_t (*get_link_af_size)(const struct net_device *dev, 186 u32 ext_filter_mask); 187 188 int (*validate_link_af)(const struct net_device *dev, 189 const struct nlattr *attr, 190 struct netlink_ext_ack *extack); 191 int (*set_link_af)(struct net_device *dev, 192 const struct nlattr *attr, 193 struct netlink_ext_ack *extack); 194 int (*fill_stats_af)(struct sk_buff *skb, 195 const struct net_device *dev); 196 size_t (*get_stats_af_size)(const struct net_device *dev); 197 }; 198 199 void rtnl_af_register(struct rtnl_af_ops *ops); 200 void rtnl_af_unregister(struct rtnl_af_ops *ops); 201 202 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]); 203 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 204 unsigned char name_assign_type, 205 const struct rtnl_link_ops *ops, 206 struct nlattr *tb[], 207 struct netlink_ext_ack *extack); 208 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh); 209 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm, 210 u32 portid, const struct nlmsghdr *nlh); 211 212 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer, 213 struct netlink_ext_ack *exterr); 214 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid); 215 216 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind) 217 218 #endif 219