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 <linux/srcu.h> 7 #include <net/netlink.h> 8 9 typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *, 10 struct netlink_ext_ack *); 11 typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *); 12 13 enum rtnl_link_flags { 14 RTNL_FLAG_DOIT_UNLOCKED = BIT(0), 15 #define RTNL_FLAG_DOIT_PERNET RTNL_FLAG_DOIT_UNLOCKED 16 #define RTNL_FLAG_DOIT_PERNET_WIP RTNL_FLAG_DOIT_UNLOCKED 17 RTNL_FLAG_BULK_DEL_SUPPORTED = BIT(1), 18 RTNL_FLAG_DUMP_UNLOCKED = BIT(2), 19 RTNL_FLAG_DUMP_SPLIT_NLM_DONE = BIT(3), /* legacy behavior */ 20 }; 21 22 enum rtnl_kinds { 23 RTNL_KIND_NEW, 24 RTNL_KIND_DEL, 25 RTNL_KIND_GET, 26 RTNL_KIND_SET 27 }; 28 #define RTNL_KIND_MASK 0x3 29 30 static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype) 31 { 32 return msgtype & RTNL_KIND_MASK; 33 } 34 35 /** 36 * struct rtnl_msg_handler - rtnetlink message type and handlers 37 * 38 * @owner: NULL for built-in, THIS_MODULE for module 39 * @protocol: Protocol family or PF_UNSPEC 40 * @msgtype: rtnetlink message type 41 * @doit: Function pointer called for each request message 42 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 43 * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions 44 */ 45 struct rtnl_msg_handler { 46 struct module *owner; 47 int protocol; 48 int msgtype; 49 rtnl_doit_func doit; 50 rtnl_dumpit_func dumpit; 51 int flags; 52 }; 53 54 void rtnl_unregister_all(int protocol); 55 56 int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n); 57 void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n); 58 59 #define rtnl_register_many(handlers) \ 60 __rtnl_register_many(handlers, ARRAY_SIZE(handlers)) 61 #define rtnl_unregister_many(handlers) \ 62 __rtnl_unregister_many(handlers, ARRAY_SIZE(handlers)) 63 64 static inline int rtnl_msg_family(const struct nlmsghdr *nlh) 65 { 66 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg)) 67 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family; 68 else 69 return AF_UNSPEC; 70 } 71 72 /** 73 * struct rtnl_link_ops - rtnetlink link operations 74 * 75 * @list: Used internally, protected by link_ops_mutex and SRCU 76 * @srcu: Used internally 77 * @kind: Identifier 78 * @netns_refund: Physical device, move to init_net on netns exit 79 * @peer_type: Peer device specific netlink attribute number (e.g. VETH_INFO_PEER) 80 * @maxtype: Highest device specific netlink attribute number 81 * @policy: Netlink policy for device specific attribute validation 82 * @validate: Optional validation function for netlink/changelink parameters 83 * @alloc: netdev allocation function, can be %NULL and is then used 84 * in place of alloc_netdev_mqs(), in this case @priv_size 85 * and @setup are unused. Returns a netdev or ERR_PTR(). 86 * @priv_size: sizeof net_device private space 87 * @setup: net_device setup function 88 * @newlink: Function for configuring and registering a new device 89 * @changelink: Function for changing parameters of an existing device 90 * @dellink: Function to remove a device 91 * @get_size: Function to calculate required room for dumping device 92 * specific netlink attributes 93 * @fill_info: Function to dump device specific netlink attributes 94 * @get_xstats_size: Function to calculate required room for dumping device 95 * specific statistics 96 * @fill_xstats: Function to dump device specific statistics 97 * @get_num_tx_queues: Function to determine number of transmit queues 98 * to create when creating a new device. 99 * @get_num_rx_queues: Function to determine number of receive queues 100 * to create when creating a new device. 101 * @get_link_net: Function to get the i/o netns of the device 102 * @get_linkxstats_size: Function to calculate the required room for 103 * dumping device-specific extended link stats 104 * @fill_linkxstats: Function to dump device-specific extended link stats 105 */ 106 struct rtnl_link_ops { 107 struct list_head list; 108 struct srcu_struct srcu; 109 110 const char *kind; 111 112 size_t priv_size; 113 struct net_device *(*alloc)(struct nlattr *tb[], 114 const char *ifname, 115 unsigned char name_assign_type, 116 unsigned int num_tx_queues, 117 unsigned int num_rx_queues); 118 void (*setup)(struct net_device *dev); 119 120 bool netns_refund; 121 const u16 peer_type; 122 unsigned int maxtype; 123 const struct nla_policy *policy; 124 int (*validate)(struct nlattr *tb[], 125 struct nlattr *data[], 126 struct netlink_ext_ack *extack); 127 128 int (*newlink)(struct net *src_net, 129 struct net_device *dev, 130 struct nlattr *tb[], 131 struct nlattr *data[], 132 struct netlink_ext_ack *extack); 133 int (*changelink)(struct net_device *dev, 134 struct nlattr *tb[], 135 struct nlattr *data[], 136 struct netlink_ext_ack *extack); 137 void (*dellink)(struct net_device *dev, 138 struct list_head *head); 139 140 size_t (*get_size)(const struct net_device *dev); 141 int (*fill_info)(struct sk_buff *skb, 142 const struct net_device *dev); 143 144 size_t (*get_xstats_size)(const struct net_device *dev); 145 int (*fill_xstats)(struct sk_buff *skb, 146 const struct net_device *dev); 147 unsigned int (*get_num_tx_queues)(void); 148 unsigned int (*get_num_rx_queues)(void); 149 150 unsigned int slave_maxtype; 151 const struct nla_policy *slave_policy; 152 int (*slave_changelink)(struct net_device *dev, 153 struct net_device *slave_dev, 154 struct nlattr *tb[], 155 struct nlattr *data[], 156 struct netlink_ext_ack *extack); 157 size_t (*get_slave_size)(const struct net_device *dev, 158 const struct net_device *slave_dev); 159 int (*fill_slave_info)(struct sk_buff *skb, 160 const struct net_device *dev, 161 const struct net_device *slave_dev); 162 struct net *(*get_link_net)(const struct net_device *dev); 163 size_t (*get_linkxstats_size)(const struct net_device *dev, 164 int attr); 165 int (*fill_linkxstats)(struct sk_buff *skb, 166 const struct net_device *dev, 167 int *prividx, int attr); 168 }; 169 170 int rtnl_link_register(struct rtnl_link_ops *ops); 171 void rtnl_link_unregister(struct rtnl_link_ops *ops); 172 173 /** 174 * struct rtnl_af_ops - rtnetlink address family operations 175 * 176 * @list: Used internally, protected by RTNL and SRCU 177 * @srcu: Used internally 178 * @family: Address family 179 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family 180 * specific netlink attributes. 181 * @get_link_af_size: Function to calculate size of address family specific 182 * netlink attributes. 183 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr 184 * for invalid configuration settings. 185 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify 186 * net_device accordingly. 187 */ 188 struct rtnl_af_ops { 189 struct list_head list; 190 struct srcu_struct srcu; 191 192 int family; 193 194 int (*fill_link_af)(struct sk_buff *skb, 195 const struct net_device *dev, 196 u32 ext_filter_mask); 197 size_t (*get_link_af_size)(const struct net_device *dev, 198 u32 ext_filter_mask); 199 200 int (*validate_link_af)(const struct net_device *dev, 201 const struct nlattr *attr, 202 struct netlink_ext_ack *extack); 203 int (*set_link_af)(struct net_device *dev, 204 const struct nlattr *attr, 205 struct netlink_ext_ack *extack); 206 int (*fill_stats_af)(struct sk_buff *skb, 207 const struct net_device *dev); 208 size_t (*get_stats_af_size)(const struct net_device *dev); 209 }; 210 211 int rtnl_af_register(struct rtnl_af_ops *ops); 212 void rtnl_af_unregister(struct rtnl_af_ops *ops); 213 214 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]); 215 struct net_device *rtnl_create_link(struct net *net, const char *ifname, 216 unsigned char name_assign_type, 217 const struct rtnl_link_ops *ops, 218 struct nlattr *tb[], 219 struct netlink_ext_ack *extack); 220 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh); 221 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm, 222 u32 portid, const struct nlmsghdr *nlh); 223 224 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer, 225 struct netlink_ext_ack *exterr); 226 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid); 227 228 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind) 229 230 #endif 231