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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/netlink.h
1 #ifndef __LINUX_NETLINK_H
2 #define __LINUX_NETLINK_H
5 #include <linux/capability.h>
6 #include <linux/skbuff.h>
7 #include <linux/export.h>
9 #include <uapi/linux/netlink.h>
13 static inline struct nlmsghdr
*nlmsg_hdr(const struct sk_buff
*skb
)
15 return (struct nlmsghdr
*)skb
->data
;
18 enum netlink_skb_flags
{
19 NETLINK_SKB_MMAPED
= 0x1, /* Packet data is mmaped */
20 NETLINK_SKB_TX
= 0x2, /* Packet was sent by userspace */
21 NETLINK_SKB_DELIVERED
= 0x4, /* Packet was delivered */
22 NETLINK_SKB_DST
= 0x8, /* Dst set in sendto or sendmsg */
25 struct netlink_skb_parms
{
26 struct scm_creds creds
; /* Skb credentials */
35 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
36 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
39 extern void netlink_table_grab(void);
40 extern void netlink_table_ungrab(void);
42 #define NL_CFG_F_NONROOT_RECV (1 << 0)
43 #define NL_CFG_F_NONROOT_SEND (1 << 1)
45 /* optional Netlink kernel configuration parameters */
46 struct netlink_kernel_cfg
{
49 void (*input
)(struct sk_buff
*skb
);
50 struct mutex
*cb_mutex
;
51 int (*bind
)(struct net
*net
, int group
);
52 void (*unbind
)(struct net
*net
, int group
);
53 bool (*compare
)(struct net
*net
, struct sock
*sk
);
56 extern struct sock
*__netlink_kernel_create(struct net
*net
, int unit
,
57 struct module
*module
,
58 struct netlink_kernel_cfg
*cfg
);
59 static inline struct sock
*
60 netlink_kernel_create(struct net
*net
, int unit
, struct netlink_kernel_cfg
*cfg
)
62 return __netlink_kernel_create(net
, unit
, THIS_MODULE
, cfg
);
66 * struct netlink_ext_ack - netlink extended ACK report struct
67 * @_msg: message string to report - don't access directly, use
69 * @bad_attr: attribute with error
71 struct netlink_ext_ack
{
73 const struct nlattr
*bad_attr
;
76 /* Always use this macro, this allows later putting the
77 * message into a separate section or such for things
78 * like translation or listing all possible messages.
79 * Currently string formatting is not supported (due
80 * to the lack of an output buffer.)
82 #define NL_SET_ERR_MSG(extack, msg) do { \
83 static const char _msg[] = (msg); \
85 (extack)->_msg = _msg; \
88 extern void netlink_kernel_release(struct sock
*sk
);
89 extern int __netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
90 extern int netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
91 extern void __netlink_clear_multicast_users(struct sock
*sk
, unsigned int group
);
92 extern void netlink_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
,
93 const struct netlink_ext_ack
*extack
);
94 extern int netlink_has_listeners(struct sock
*sk
, unsigned int group
);
96 extern int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 portid
, int nonblock
);
97 extern int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 portid
,
98 __u32 group
, gfp_t allocation
);
99 extern int netlink_broadcast_filtered(struct sock
*ssk
, struct sk_buff
*skb
,
100 __u32 portid
, __u32 group
, gfp_t allocation
,
101 int (*filter
)(struct sock
*dsk
, struct sk_buff
*skb
, void *data
),
103 extern int netlink_set_err(struct sock
*ssk
, __u32 portid
, __u32 group
, int code
);
104 extern int netlink_register_notifier(struct notifier_block
*nb
);
105 extern int netlink_unregister_notifier(struct notifier_block
*nb
);
107 /* finegrained unicast helpers: */
108 struct sock
*netlink_getsockbyfilp(struct file
*filp
);
109 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
,
110 long *timeo
, struct sock
*ssk
);
111 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
);
112 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
);
114 static inline struct sk_buff
*
115 netlink_skb_clone(struct sk_buff
*skb
, gfp_t gfp_mask
)
117 struct sk_buff
*nskb
;
119 nskb
= skb_clone(skb
, gfp_mask
);
123 /* This is a large skb, set destructor callback to release head */
124 if (is_vmalloc_addr(skb
->head
))
125 nskb
->destructor
= skb
->destructor
;
131 * skb should fit one page. This choice is good for headerless malloc.
132 * But we should limit to 8K so that userspace does not have to
133 * use enormous buffer sizes on recvmsg() calls just to avoid
134 * MSG_TRUNC when PAGE_SIZE is very large.
136 #if PAGE_SIZE < 8192UL
137 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
139 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
142 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
145 struct netlink_callback
{
147 const struct nlmsghdr
*nlh
;
148 int (*start
)(struct netlink_callback
*);
149 int (*dump
)(struct sk_buff
* skb
,
150 struct netlink_callback
*cb
);
151 int (*done
)(struct netlink_callback
*cb
);
153 /* the module that dump function belong to */
154 struct module
*module
;
157 unsigned int prev_seq
, seq
;
161 struct netlink_notify
{
168 __nlmsg_put(struct sk_buff
*skb
, u32 portid
, u32 seq
, int type
, int len
, int flags
);
170 struct netlink_dump_control
{
171 int (*start
)(struct netlink_callback
*);
172 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*);
173 int (*done
)(struct netlink_callback
*);
175 struct module
*module
;
179 extern int __netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
180 const struct nlmsghdr
*nlh
,
181 struct netlink_dump_control
*control
);
182 static inline int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
183 const struct nlmsghdr
*nlh
,
184 struct netlink_dump_control
*control
)
186 if (!control
->module
)
187 control
->module
= THIS_MODULE
;
189 return __netlink_dump_start(ssk
, skb
, nlh
, control
);
193 struct net_device
*dev
;
194 struct module
*module
;
195 struct list_head list
;
198 extern int netlink_add_tap(struct netlink_tap
*nt
);
199 extern int netlink_remove_tap(struct netlink_tap
*nt
);
201 bool __netlink_ns_capable(const struct netlink_skb_parms
*nsp
,
202 struct user_namespace
*ns
, int cap
);
203 bool netlink_ns_capable(const struct sk_buff
*skb
,
204 struct user_namespace
*ns
, int cap
);
205 bool netlink_capable(const struct sk_buff
*skb
, int cap
);
206 bool netlink_net_capable(const struct sk_buff
*skb
, int cap
);
208 #endif /* __LINUX_NETLINK_H */