630 lines
20 KiB
C
630 lines
20 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_GENERIC_NETLINK_H
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#define __NET_GENERIC_NETLINK_H
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#include <linux/genetlink.h>
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#include <net/netlink.h>
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#include <net/net_namespace.h>
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#define GENLMSG_DEFAULT_SIZE (NLMSG_DEFAULT_SIZE - GENL_HDRLEN)
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/* Binding to multicast group requires %CAP_NET_ADMIN */
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#define GENL_MCAST_CAP_NET_ADMIN BIT(0)
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/* Binding to multicast group requires %CAP_SYS_ADMIN */
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#define GENL_MCAST_CAP_SYS_ADMIN BIT(1)
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/**
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* struct genl_multicast_group - generic netlink multicast group
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* @name: name of the multicast group, names are per-family
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* @flags: GENL_MCAST_* flags
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*/
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struct genl_multicast_group {
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char name[GENL_NAMSIZ];
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u8 flags;
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};
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struct genl_split_ops;
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struct genl_info;
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/**
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* struct genl_family - generic netlink family
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* @hdrsize: length of user specific header in bytes
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* @name: name of family
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* @version: protocol version
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* @maxattr: maximum number of attributes supported
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* @policy: netlink policy
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* @netnsok: set to true if the family can handle network
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* namespaces and should be presented in all of them
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* @parallel_ops: operations can be called in parallel and aren't
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* synchronized by the core genetlink code
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* @pre_doit: called before an operation's doit callback, it may
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* do additional, common, filtering and return an error
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* @post_doit: called after an operation's doit callback, it may
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* undo operations done by pre_doit, for example release locks
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* @module: pointer to the owning module (set to THIS_MODULE)
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* @mcgrps: multicast groups used by this family
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* @n_mcgrps: number of multicast groups
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* @resv_start_op: first operation for which reserved fields of the header
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* can be validated and policies are required (see below);
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* new families should leave this field at zero
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* @ops: the operations supported by this family
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* @n_ops: number of operations supported by this family
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* @small_ops: the small-struct operations supported by this family
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* @n_small_ops: number of small-struct operations supported by this family
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* @split_ops: the split do/dump form of operation definition
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* @n_split_ops: number of entries in @split_ops, not that with split do/dump
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* ops the number of entries is not the same as number of commands
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* @sock_priv_size: the size of per-socket private memory
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* @sock_priv_init: the per-socket private memory initializer
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* @sock_priv_destroy: the per-socket private memory destructor
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*
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* Attribute policies (the combination of @policy and @maxattr fields)
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* can be attached at the family level or at the operation level.
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* If both are present the per-operation policy takes precedence.
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* For operations before @resv_start_op lack of policy means that the core
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* will perform no attribute parsing or validation. For newer operations
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* if policy is not provided core will reject all TLV attributes.
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*/
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struct genl_family {
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unsigned int hdrsize;
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char name[GENL_NAMSIZ];
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unsigned int version;
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unsigned int maxattr;
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u8 netnsok:1;
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u8 parallel_ops:1;
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u8 n_ops;
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u8 n_small_ops;
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u8 n_split_ops;
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u8 n_mcgrps;
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u8 resv_start_op;
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const struct nla_policy *policy;
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int (*pre_doit)(const struct genl_split_ops *ops,
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struct sk_buff *skb,
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struct genl_info *info);
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void (*post_doit)(const struct genl_split_ops *ops,
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struct sk_buff *skb,
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struct genl_info *info);
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const struct genl_ops * ops;
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const struct genl_small_ops *small_ops;
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const struct genl_split_ops *split_ops;
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const struct genl_multicast_group *mcgrps;
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struct module *module;
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size_t sock_priv_size;
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void (*sock_priv_init)(void *priv);
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void (*sock_priv_destroy)(void *priv);
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/* private: internal use only */
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/* protocol family identifier */
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int id;
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/* starting number of multicast group IDs in this family */
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unsigned int mcgrp_offset;
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/* list of per-socket privs */
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struct xarray *sock_privs;
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};
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/**
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* struct genl_info - receiving information
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* @snd_seq: sending sequence number
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* @snd_portid: netlink portid of sender
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* @family: generic netlink family
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* @nlhdr: netlink message header
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* @genlhdr: generic netlink message header
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* @attrs: netlink attributes
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* @_net: network namespace
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* @user_ptr: user pointers
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* @extack: extended ACK report struct
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*/
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struct genl_info {
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u32 snd_seq;
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u32 snd_portid;
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const struct genl_family *family;
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const struct nlmsghdr * nlhdr;
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struct genlmsghdr * genlhdr;
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struct nlattr ** attrs;
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possible_net_t _net;
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void * user_ptr[2];
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struct netlink_ext_ack *extack;
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};
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static inline struct net *genl_info_net(const struct genl_info *info)
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{
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return read_pnet(&info->_net);
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}
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static inline void genl_info_net_set(struct genl_info *info, struct net *net)
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{
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write_pnet(&info->_net, net);
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}
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static inline void *genl_info_userhdr(const struct genl_info *info)
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{
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return (u8 *)info->genlhdr + GENL_HDRLEN;
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}
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#define GENL_SET_ERR_MSG(info, msg) NL_SET_ERR_MSG((info)->extack, msg)
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#define GENL_SET_ERR_MSG_FMT(info, msg, args...) \
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NL_SET_ERR_MSG_FMT((info)->extack, msg, ##args)
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/* Report that a root attribute is missing */
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#define GENL_REQ_ATTR_CHECK(info, attr) ({ \
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struct genl_info *__info = (info); \
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\
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NL_REQ_ATTR_CHECK(__info->extack, NULL, __info->attrs, (attr)); \
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})
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enum genl_validate_flags {
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GENL_DONT_VALIDATE_STRICT = BIT(0),
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GENL_DONT_VALIDATE_DUMP = BIT(1),
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GENL_DONT_VALIDATE_DUMP_STRICT = BIT(2),
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};
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/**
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* struct genl_small_ops - generic netlink operations (small version)
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* @cmd: command identifier
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* @internal_flags: flags used by the family
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* @flags: GENL_* flags (%GENL_ADMIN_PERM or %GENL_UNS_ADMIN_PERM)
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* @validate: validation flags from enum genl_validate_flags
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* @doit: standard command callback
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* @dumpit: callback for dumpers
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*
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* This is a cut-down version of struct genl_ops for users who don't need
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* most of the ancillary infra and want to save space.
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*/
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struct genl_small_ops {
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int (*doit)(struct sk_buff *skb, struct genl_info *info);
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int (*dumpit)(struct sk_buff *skb, struct netlink_callback *cb);
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u8 cmd;
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u8 internal_flags;
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u8 flags;
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u8 validate;
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};
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/**
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* struct genl_ops - generic netlink operations
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* @cmd: command identifier
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* @internal_flags: flags used by the family
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* @flags: GENL_* flags (%GENL_ADMIN_PERM or %GENL_UNS_ADMIN_PERM)
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* @maxattr: maximum number of attributes supported
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* @policy: netlink policy (takes precedence over family policy)
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* @validate: validation flags from enum genl_validate_flags
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* @doit: standard command callback
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* @start: start callback for dumps
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* @dumpit: callback for dumpers
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* @done: completion callback for dumps
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*/
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struct genl_ops {
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int (*doit)(struct sk_buff *skb,
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struct genl_info *info);
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int (*start)(struct netlink_callback *cb);
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int (*dumpit)(struct sk_buff *skb,
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struct netlink_callback *cb);
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int (*done)(struct netlink_callback *cb);
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const struct nla_policy *policy;
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unsigned int maxattr;
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u8 cmd;
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u8 internal_flags;
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u8 flags;
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u8 validate;
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};
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/**
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* struct genl_split_ops - generic netlink operations (do/dump split version)
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* @cmd: command identifier
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* @internal_flags: flags used by the family
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* @flags: GENL_* flags (%GENL_ADMIN_PERM or %GENL_UNS_ADMIN_PERM)
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* @validate: validation flags from enum genl_validate_flags
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* @policy: netlink policy (takes precedence over family policy)
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* @maxattr: maximum number of attributes supported
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*
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* Do callbacks:
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* @pre_doit: called before an operation's @doit callback, it may
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* do additional, common, filtering and return an error
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* @doit: standard command callback
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* @post_doit: called after an operation's @doit callback, it may
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* undo operations done by pre_doit, for example release locks
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*
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* Dump callbacks:
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* @start: start callback for dumps
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* @dumpit: callback for dumpers
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* @done: completion callback for dumps
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*
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* Do callbacks can be used if %GENL_CMD_CAP_DO is set in @flags.
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* Dump callbacks can be used if %GENL_CMD_CAP_DUMP is set in @flags.
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* Exactly one of those flags must be set.
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*/
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struct genl_split_ops {
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union {
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struct {
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int (*pre_doit)(const struct genl_split_ops *ops,
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struct sk_buff *skb,
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struct genl_info *info);
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int (*doit)(struct sk_buff *skb,
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struct genl_info *info);
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void (*post_doit)(const struct genl_split_ops *ops,
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struct sk_buff *skb,
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struct genl_info *info);
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};
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struct {
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int (*start)(struct netlink_callback *cb);
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int (*dumpit)(struct sk_buff *skb,
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struct netlink_callback *cb);
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int (*done)(struct netlink_callback *cb);
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};
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};
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const struct nla_policy *policy;
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unsigned int maxattr;
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u8 cmd;
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u8 internal_flags;
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u8 flags;
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u8 validate;
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};
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/**
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* struct genl_dumpit_info - info that is available during dumpit op call
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* @op: generic netlink ops - for internal genl code usage
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* @attrs: netlink attributes
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* @info: struct genl_info describing the request
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*/
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struct genl_dumpit_info {
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struct genl_split_ops op;
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struct genl_info info;
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};
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static inline const struct genl_dumpit_info *
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genl_dumpit_info(struct netlink_callback *cb)
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{
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return cb->data;
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}
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static inline const struct genl_info *
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genl_info_dump(struct netlink_callback *cb)
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{
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return &genl_dumpit_info(cb)->info;
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}
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/**
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* genl_info_init_ntf() - initialize genl_info for notifications
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* @info: genl_info struct to set up
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* @family: pointer to the genetlink family
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* @cmd: command to be used in the notification
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*
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* Initialize a locally declared struct genl_info to pass to various APIs.
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* Intended to be used when creating notifications.
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*/
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static inline void
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genl_info_init_ntf(struct genl_info *info, const struct genl_family *family,
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u8 cmd)
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{
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struct genlmsghdr *hdr = (void *) &info->user_ptr[0];
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memset(info, 0, sizeof(*info));
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info->family = family;
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info->genlhdr = hdr;
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hdr->cmd = cmd;
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}
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static inline bool genl_info_is_ntf(const struct genl_info *info)
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{
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return !info->nlhdr;
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}
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void *__genl_sk_priv_get(struct genl_family *family, struct sock *sk);
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void *genl_sk_priv_get(struct genl_family *family, struct sock *sk);
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int genl_register_family(struct genl_family *family);
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int genl_unregister_family(const struct genl_family *family);
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void genl_notify(const struct genl_family *family, struct sk_buff *skb,
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struct genl_info *info, u32 group, gfp_t flags);
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void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
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const struct genl_family *family, int flags, u8 cmd);
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static inline void *
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__genlmsg_iput(struct sk_buff *skb, const struct genl_info *info, int flags)
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{
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return genlmsg_put(skb, info->snd_portid, info->snd_seq, info->family,
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flags, info->genlhdr->cmd);
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}
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/**
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* genlmsg_iput - start genetlink message based on genl_info
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* @skb: skb in which message header will be placed
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* @info: genl_info as provided to do/dump handlers
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*
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* Convenience wrapper which starts a genetlink message based on
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* information in user request. @info should be either the struct passed
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* by genetlink core to do/dump handlers (when constructing replies to
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* such requests) or a struct initialized by genl_info_init_ntf()
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* when constructing notifications.
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*
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* Returns pointer to new genetlink header.
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*/
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static inline void *
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genlmsg_iput(struct sk_buff *skb, const struct genl_info *info)
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{
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return __genlmsg_iput(skb, info, 0);
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}
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/**
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* genlmsg_nlhdr - Obtain netlink header from user specified header
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* @user_hdr: user header as returned from genlmsg_put()
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*
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* Returns pointer to netlink header.
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*/
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static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr)
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{
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return (struct nlmsghdr *)((char *)user_hdr -
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GENL_HDRLEN -
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NLMSG_HDRLEN);
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}
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/**
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* genlmsg_parse_deprecated - parse attributes of a genetlink message
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* @nlh: netlink message header
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* @family: genetlink message family
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* @tb: destination array with maxtype+1 elements
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* @maxtype: maximum attribute type to be expected
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* @policy: validation policy
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* @extack: extended ACK report struct
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*/
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static inline int genlmsg_parse_deprecated(const struct nlmsghdr *nlh,
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const struct genl_family *family,
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struct nlattr *tb[], int maxtype,
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const struct nla_policy *policy,
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struct netlink_ext_ack *extack)
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{
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return __nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype,
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policy, NL_VALIDATE_LIBERAL, extack);
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}
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/**
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* genlmsg_parse - parse attributes of a genetlink message
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* @nlh: netlink message header
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* @family: genetlink message family
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* @tb: destination array with maxtype+1 elements
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* @maxtype: maximum attribute type to be expected
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* @policy: validation policy
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* @extack: extended ACK report struct
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*/
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static inline int genlmsg_parse(const struct nlmsghdr *nlh,
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const struct genl_family *family,
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struct nlattr *tb[], int maxtype,
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const struct nla_policy *policy,
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struct netlink_ext_ack *extack)
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{
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return __nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype,
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policy, NL_VALIDATE_STRICT, extack);
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}
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/**
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* genl_dump_check_consistent - check if sequence is consistent and advertise if not
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* @cb: netlink callback structure that stores the sequence number
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* @user_hdr: user header as returned from genlmsg_put()
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*
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* Cf. nl_dump_check_consistent(), this just provides a wrapper to make it
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* simpler to use with generic netlink.
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*/
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static inline void genl_dump_check_consistent(struct netlink_callback *cb,
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void *user_hdr)
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{
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nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr));
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}
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/**
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* genlmsg_put_reply - Add generic netlink header to a reply message
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* @skb: socket buffer holding the message
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* @info: receiver info
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* @family: generic netlink family
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* @flags: netlink message flags
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* @cmd: generic netlink command
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*
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* Returns pointer to user specific header
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*/
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static inline void *genlmsg_put_reply(struct sk_buff *skb,
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struct genl_info *info,
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const struct genl_family *family,
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int flags, u8 cmd)
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{
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return genlmsg_put(skb, info->snd_portid, info->snd_seq, family,
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flags, cmd);
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}
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/**
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* genlmsg_end - Finalize a generic netlink message
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* @skb: socket buffer the message is stored in
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* @hdr: user specific header
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*/
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static inline void genlmsg_end(struct sk_buff *skb, void *hdr)
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{
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nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
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}
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/**
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* genlmsg_cancel - Cancel construction of a generic netlink message
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* @skb: socket buffer the message is stored in
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* @hdr: generic netlink message header
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*/
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static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr)
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{
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if (hdr)
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nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
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}
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/**
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* genlmsg_multicast_netns_filtered - multicast a netlink message
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* to a specific netns with filter
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* function
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* @family: the generic netlink family
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* @net: the net namespace
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* @skb: netlink message as socket buffer
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* @portid: own netlink portid to avoid sending to yourself
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* @group: offset of multicast group in groups array
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* @flags: allocation flags
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* @filter: filter function
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* @filter_data: filter function private data
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*
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* Return: 0 on success, negative error code for failure.
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*/
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static inline int
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genlmsg_multicast_netns_filtered(const struct genl_family *family,
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struct net *net, struct sk_buff *skb,
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u32 portid, unsigned int group, gfp_t flags,
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netlink_filter_fn filter,
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void *filter_data)
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{
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if (WARN_ON_ONCE(group >= family->n_mcgrps))
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return -EINVAL;
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group = family->mcgrp_offset + group;
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return nlmsg_multicast_filtered(net->genl_sock, skb, portid, group,
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flags, filter, filter_data);
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}
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/**
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* genlmsg_multicast_netns - multicast a netlink message to a specific netns
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* @family: the generic netlink family
|
|
* @net: the net namespace
|
|
* @skb: netlink message as socket buffer
|
|
* @portid: own netlink portid to avoid sending to yourself
|
|
* @group: offset of multicast group in groups array
|
|
* @flags: allocation flags
|
|
*/
|
|
static inline int genlmsg_multicast_netns(const struct genl_family *family,
|
|
struct net *net, struct sk_buff *skb,
|
|
u32 portid, unsigned int group, gfp_t flags)
|
|
{
|
|
return genlmsg_multicast_netns_filtered(family, net, skb, portid,
|
|
group, flags, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* genlmsg_multicast - multicast a netlink message to the default netns
|
|
* @family: the generic netlink family
|
|
* @skb: netlink message as socket buffer
|
|
* @portid: own netlink portid to avoid sending to yourself
|
|
* @group: offset of multicast group in groups array
|
|
* @flags: allocation flags
|
|
*/
|
|
static inline int genlmsg_multicast(const struct genl_family *family,
|
|
struct sk_buff *skb, u32 portid,
|
|
unsigned int group, gfp_t flags)
|
|
{
|
|
return genlmsg_multicast_netns(family, &init_net, skb,
|
|
portid, group, flags);
|
|
}
|
|
|
|
/**
|
|
* genlmsg_multicast_allns - multicast a netlink message to all net namespaces
|
|
* @family: the generic netlink family
|
|
* @skb: netlink message as socket buffer
|
|
* @portid: own netlink portid to avoid sending to yourself
|
|
* @group: offset of multicast group in groups array
|
|
* @flags: allocation flags
|
|
*
|
|
* This function must hold the RTNL or rcu_read_lock().
|
|
*/
|
|
int genlmsg_multicast_allns(const struct genl_family *family,
|
|
struct sk_buff *skb, u32 portid,
|
|
unsigned int group, gfp_t flags);
|
|
|
|
/**
|
|
* genlmsg_unicast - unicast a netlink message
|
|
* @net: network namespace to look up @portid in
|
|
* @skb: netlink message as socket buffer
|
|
* @portid: netlink portid of the destination socket
|
|
*/
|
|
static inline int genlmsg_unicast(struct net *net, struct sk_buff *skb, u32 portid)
|
|
{
|
|
return nlmsg_unicast(net->genl_sock, skb, portid);
|
|
}
|
|
|
|
/**
|
|
* genlmsg_reply - reply to a request
|
|
* @skb: netlink message to be sent back
|
|
* @info: receiver information
|
|
*/
|
|
static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
return genlmsg_unicast(genl_info_net(info), skb, info->snd_portid);
|
|
}
|
|
|
|
/**
|
|
* genlmsg_data - head of message payload
|
|
* @gnlh: genetlink message header
|
|
*/
|
|
static inline void *genlmsg_data(const struct genlmsghdr *gnlh)
|
|
{
|
|
return ((unsigned char *) gnlh + GENL_HDRLEN);
|
|
}
|
|
|
|
/**
|
|
* genlmsg_len - length of message payload
|
|
* @gnlh: genetlink message header
|
|
*/
|
|
static inline int genlmsg_len(const struct genlmsghdr *gnlh)
|
|
{
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -
|
|
NLMSG_HDRLEN);
|
|
return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
|
|
}
|
|
|
|
/**
|
|
* genlmsg_msg_size - length of genetlink message not including padding
|
|
* @payload: length of message payload
|
|
*/
|
|
static inline int genlmsg_msg_size(int payload)
|
|
{
|
|
return GENL_HDRLEN + payload;
|
|
}
|
|
|
|
/**
|
|
* genlmsg_total_size - length of genetlink message including padding
|
|
* @payload: length of message payload
|
|
*/
|
|
static inline int genlmsg_total_size(int payload)
|
|
{
|
|
return NLMSG_ALIGN(genlmsg_msg_size(payload));
|
|
}
|
|
|
|
/**
|
|
* genlmsg_new - Allocate a new generic netlink message
|
|
* @payload: size of the message payload
|
|
* @flags: the type of memory to allocate.
|
|
*/
|
|
static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
|
|
{
|
|
return nlmsg_new(genlmsg_total_size(payload), flags);
|
|
}
|
|
|
|
/**
|
|
* genl_set_err - report error to genetlink broadcast listeners
|
|
* @family: the generic netlink family
|
|
* @net: the network namespace to report the error to
|
|
* @portid: the PORTID of a process that we want to skip (if any)
|
|
* @group: the broadcast group that will notice the error
|
|
* (this is the offset of the multicast group in the groups array)
|
|
* @code: error code, must be negative (as usual in kernelspace)
|
|
*
|
|
* This function returns the number of broadcast listeners that have set the
|
|
* NETLINK_RECV_NO_ENOBUFS socket option.
|
|
*/
|
|
static inline int genl_set_err(const struct genl_family *family,
|
|
struct net *net, u32 portid,
|
|
u32 group, int code)
|
|
{
|
|
if (WARN_ON_ONCE(group >= family->n_mcgrps))
|
|
return -EINVAL;
|
|
group = family->mcgrp_offset + group;
|
|
return netlink_set_err(net->genl_sock, portid, group, code);
|
|
}
|
|
|
|
static inline int genl_has_listeners(const struct genl_family *family,
|
|
struct net *net, unsigned int group)
|
|
{
|
|
if (WARN_ON_ONCE(group >= family->n_mcgrps))
|
|
return -EINVAL;
|
|
group = family->mcgrp_offset + group;
|
|
return netlink_has_listeners(net->genl_sock, group);
|
|
}
|
|
#endif /* __NET_GENERIC_NETLINK_H */
|