include/rdma/rdma_netlink.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _RDMA_NETLINK_H
   3 #define _RDMA_NETLINK_H
   4
   5
   6 #include <linux/netlink.h>
   7 #include <uapi/rdma/rdma_netlink.h>
   8
   9 enum {
  10         RDMA_NLDEV_ATTR_EMPTY_STRING = 1,
  11         RDMA_NLDEV_ATTR_ENTRY_STRLEN = 16,
  12         RDMA_NLDEV_ATTR_CHARDEV_TYPE_SIZE = 32,
  13 };
  14
  15 struct rdma_nl_cbs {
  16         int (*doit)(struct sk_buff *skb, struct nlmsghdr *nlh,
  17                     struct netlink_ext_ack *extack);
  18         int (*dump)(struct sk_buff *skb, struct netlink_callback *nlcb);
  19         u8 flags;
  20 };
  21
  22 enum rdma_nl_flags {
  23         /* Require CAP_NET_ADMIN */
  24         RDMA_NL_ADMIN_PERM      = 1 << 0,
  25 };
  26
  27 /* Define this module as providing netlink services for NETLINK_RDMA, with
  28  * index _index.  Since the client indexes were setup in a uapi header as an
  29  * enum and we do no want to change that, the user must supply the expanded
  30  * constant as well and the compiler checks they are the same.
  31  */
  32 #define MODULE_ALIAS_RDMA_NETLINK(_index, _val)                                \
  33         static inline void __chk_##_index(void)                                \
  34         {                                                                      \
  35                 BUILD_BUG_ON(_index != _val);                                  \
  36         }                                                                      \
  37         MODULE_ALIAS("rdma-netlink-subsys-" __stringify(_val))
  38
  39 /**
  40  * Register client in RDMA netlink.
  41  * @index: Index of the added client
  42  * @cb_table: A table for op->callback
  43  */
  44 void rdma_nl_register(unsigned int index,
  45                       const struct rdma_nl_cbs cb_table[]);
  46
  47 /**
  48  * Remove a client from IB netlink.
  49  * @index: Index of the removed IB client.
  50  */
  51 void rdma_nl_unregister(unsigned int index);
  52
  53 /**
  54  * Put a new message in a supplied skb.
  55  * @skb: The netlink skb.
  56  * @nlh: Pointer to put the header of the new netlink message.
  57  * @seq: The message sequence number.
  58  * @len: The requested message length to allocate.
  59  * @client: Calling IB netlink client.
  60  * @op: message content op.
  61  * Returns the allocated buffer on success and NULL on failure.
  62  */
  63 void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
  64                    int len, int client, int op, int flags);
  65 /**
  66  * Put a new attribute in a supplied skb.
  67  * @skb: The netlink skb.
  68  * @nlh: Header of the netlink message to append the attribute to.
  69  * @len: The length of the attribute data.
  70  * @data: The attribute data to put.
  71  * @type: The attribute type.
  72  * Returns the 0 and a negative error code on failure.
  73  */
  74 int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
  75                   int len, void *data, int type);
  76
  77 /**
  78  * Send the supplied skb to a specific userspace PID.
  79  * @net: Net namespace in which to send the skb
  80  * @skb: The netlink skb
  81  * @pid: Userspace netlink process ID
  82  * Returns 0 on success or a negative error code.
  83  */
  84 int rdma_nl_unicast(struct net *net, struct sk_buff *skb, u32 pid);
  85
  86 /**
  87  * Send, with wait/1 retry, the supplied skb to a specific userspace PID.
  88  * @net: Net namespace in which to send the skb
  89  * @skb: The netlink skb
  90  * @pid: Userspace netlink process ID
  91  * Returns 0 on success or a negative error code.
  92  */
  93 int rdma_nl_unicast_wait(struct net *net, struct sk_buff *skb, __u32 pid);
  94
  95 /**
  96  * Send the supplied skb to a netlink group.
  97  * @net: Net namespace in which to send the skb
  98  * @skb: The netlink skb
  99  * @group: Netlink group ID
 100  * @flags: allocation flags
 101  * Returns 0 on success or a negative error code.
 102  */
 103 int rdma_nl_multicast(struct net *net, struct sk_buff *skb,
 104                       unsigned int group, gfp_t flags);
 105
 106 /**
 107  * Check if there are any listeners to the netlink group
 108  * @group: the netlink group ID
 109  * Returns true on success or false if no listeners.
 110  */
 111 bool rdma_nl_chk_listeners(unsigned int group);
 112
 113 struct rdma_link_ops {
 114         struct list_head list;
 115         const char *type;
 116         int (*newlink)(const char *ibdev_name, struct net_device *ndev);
 117 };
 118
 119 void rdma_link_register(struct rdma_link_ops *ops);
 120 void rdma_link_unregister(struct rdma_link_ops *ops);
 121
 122 #define MODULE_ALIAS_RDMA_LINK(type) MODULE_ALIAS("rdma-link-" type)
 123 #define MODULE_ALIAS_RDMA_CLIENT(type) MODULE_ALIAS("rdma-client-" type)
 124
 125 #endif /* _RDMA_NETLINK_H */