include/net/rtnetlink.h

   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 = 1,
  14 };
  15
  16 void rtnl_register(int protocol, int msgtype,
  17                    rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
  18 int rtnl_register_module(struct module *owner, int protocol, int msgtype,
  19                          rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
  20 int rtnl_unregister(int protocol, int msgtype);
  21 void rtnl_unregister_all(int protocol);
  22
  23 static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
  24 {
  25         if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
  26                 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
  27         else
  28                 return AF_UNSPEC;
  29 }
  30
  31 /**
  32  *      struct rtnl_link_ops - rtnetlink link operations
  33  *
  34  *      @list: Used internally
  35  *      @kind: Identifier
  36  *      @maxtype: Highest device specific netlink attribute number
  37  *      @policy: Netlink policy for device specific attribute validation
  38  *      @validate: Optional validation function for netlink/changelink parameters
  39  *      @priv_size: sizeof net_device private space
  40  *      @setup: net_device setup function
  41  *      @newlink: Function for configuring and registering a new device
  42  *      @changelink: Function for changing parameters of an existing device
  43  *      @dellink: Function to remove a device
  44  *      @get_size: Function to calculate required room for dumping device
  45  *                 specific netlink attributes
  46  *      @fill_info: Function to dump device specific netlink attributes
  47  *      @get_xstats_size: Function to calculate required room for dumping device
  48  *                        specific statistics
  49  *      @fill_xstats: Function to dump device specific statistics
  50  *      @get_num_tx_queues: Function to determine number of transmit queues
  51  *                          to create when creating a new device.
  52  *      @get_num_rx_queues: Function to determine number of receive queues
  53  *                          to create when creating a new device.
  54  *      @get_link_net: Function to get the i/o netns of the device
  55  *      @get_linkxstats_size: Function to calculate the required room for
  56  *                            dumping device-specific extended link stats
  57  *      @fill_linkxstats: Function to dump device-specific extended link stats
  58  */
  59 struct rtnl_link_ops {
  60         struct list_head        list;
  61
  62         const char              *kind;
  63
  64         size_t                  priv_size;
  65         void                    (*setup)(struct net_device *dev);
  66
  67         int                     maxtype;
  68         const struct nla_policy *policy;
  69         int                     (*validate)(struct nlattr *tb[],
  70                                             struct nlattr *data[],
  71                                             struct netlink_ext_ack *extack);
  72
  73         int                     (*newlink)(struct net *src_net,
  74                                            struct net_device *dev,
  75                                            struct nlattr *tb[],
  76                                            struct nlattr *data[],
  77                                            struct netlink_ext_ack *extack);
  78         int                     (*changelink)(struct net_device *dev,
  79                                               struct nlattr *tb[],
  80                                               struct nlattr *data[],
  81                                               struct netlink_ext_ack *extack);
  82         void                    (*dellink)(struct net_device *dev,
  83                                            struct list_head *head);
  84
  85         size_t                  (*get_size)(const struct net_device *dev);
  86         int                     (*fill_info)(struct sk_buff *skb,
  87                                              const struct net_device *dev);
  88
  89         size_t                  (*get_xstats_size)(const struct net_device *dev);
  90         int                     (*fill_xstats)(struct sk_buff *skb,
  91                                                const struct net_device *dev);
  92         unsigned int            (*get_num_tx_queues)(void);
  93         unsigned int            (*get_num_rx_queues)(void);
  94
  95         int                     slave_maxtype;
  96         const struct nla_policy *slave_policy;
  97         int                     (*slave_changelink)(struct net_device *dev,
  98                                                     struct net_device *slave_dev,
  99                                                     struct nlattr *tb[],
 100                                                     struct nlattr *data[],
 101                                                     struct netlink_ext_ack *extack);
 102         size_t                  (*get_slave_size)(const struct net_device *dev,
 103                                                   const struct net_device *slave_dev);
 104         int                     (*fill_slave_info)(struct sk_buff *skb,
 105                                                    const struct net_device *dev,
 106                                                    const struct net_device *slave_dev);
 107         struct net              *(*get_link_net)(const struct net_device *dev);
 108         size_t                  (*get_linkxstats_size)(const struct net_device *dev,
 109                                                        int attr);
 110         int                     (*fill_linkxstats)(struct sk_buff *skb,
 111                                                    const struct net_device *dev,
 112                                                    int *prividx, int attr);
 113 };
 114
 115 int __rtnl_link_register(struct rtnl_link_ops *ops);
 116 void __rtnl_link_unregister(struct rtnl_link_ops *ops);
 117
 118 int rtnl_link_register(struct rtnl_link_ops *ops);
 119 void rtnl_link_unregister(struct rtnl_link_ops *ops);
 120
 121 /**
 122  *      struct rtnl_af_ops - rtnetlink address family operations
 123  *
 124  *      @list: Used internally
 125  *      @family: Address family
 126  *      @fill_link_af: Function to fill IFLA_AF_SPEC with address family
 127  *                     specific netlink attributes.
 128  *      @get_link_af_size: Function to calculate size of address family specific
 129  *                         netlink attributes.
 130  *      @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
 131  *                         for invalid configuration settings.
 132  *      @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
 133  *                    net_device accordingly.
 134  */
 135 struct rtnl_af_ops {
 136         struct list_head        list;
 137         int                     family;
 138
 139         int                     (*fill_link_af)(struct sk_buff *skb,
 140                                                 const struct net_device *dev,
 141                                                 u32 ext_filter_mask);
 142         size_t                  (*get_link_af_size)(const struct net_device *dev,
 143                                                     u32 ext_filter_mask);
 144
 145         int                     (*validate_link_af)(const struct net_device *dev,
 146                                                     const struct nlattr *attr);
 147         int                     (*set_link_af)(struct net_device *dev,
 148                                                const struct nlattr *attr);
 149
 150         int                     (*fill_stats_af)(struct sk_buff *skb,
 151                                                  const struct net_device *dev);
 152         size_t                  (*get_stats_af_size)(const struct net_device *dev);
 153 };
 154
 155 void rtnl_af_register(struct rtnl_af_ops *ops);
 156 void rtnl_af_unregister(struct rtnl_af_ops *ops);
 157
 158 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
 159 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
 160                                     unsigned char name_assign_type,
 161                                     const struct rtnl_link_ops *ops,
 162                                     struct nlattr *tb[]);
 163 int rtnl_delete_link(struct net_device *dev);
 164 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
 165
 166 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
 167                         struct netlink_ext_ack *exterr);
 168
 169 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
 170
 171 #endif