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 */
33 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
34 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
37 extern void netlink_table_grab(void);
38 extern void netlink_table_ungrab(void);
40 #define NL_CFG_F_NONROOT_RECV (1 << 0)
41 #define NL_CFG_F_NONROOT_SEND (1 << 1)
43 /* optional Netlink kernel configuration parameters */
44 struct netlink_kernel_cfg
{
47 void (*input
)(struct sk_buff
*skb
);
48 struct mutex
*cb_mutex
;
49 int (*bind
)(int group
);
50 void (*unbind
)(int group
);
51 bool (*compare
)(struct net
*net
, struct sock
*sk
);
54 extern struct sock
*__netlink_kernel_create(struct net
*net
, int unit
,
55 struct module
*module
,
56 struct netlink_kernel_cfg
*cfg
);
57 static inline struct sock
*
58 netlink_kernel_create(struct net
*net
, int unit
, struct netlink_kernel_cfg
*cfg
)
60 return __netlink_kernel_create(net
, unit
, THIS_MODULE
, cfg
);
63 extern void netlink_kernel_release(struct sock
*sk
);
64 extern int __netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
65 extern int netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
66 extern void __netlink_clear_multicast_users(struct sock
*sk
, unsigned int group
);
67 extern void netlink_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
);
68 extern int netlink_has_listeners(struct sock
*sk
, unsigned int group
);
69 extern struct sk_buff
*netlink_alloc_skb(struct sock
*ssk
, unsigned int size
,
70 u32 dst_portid
, gfp_t gfp_mask
);
71 extern int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 portid
, int nonblock
);
72 extern int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 portid
,
73 __u32 group
, gfp_t allocation
);
74 extern int netlink_broadcast_filtered(struct sock
*ssk
, struct sk_buff
*skb
,
75 __u32 portid
, __u32 group
, gfp_t allocation
,
76 int (*filter
)(struct sock
*dsk
, struct sk_buff
*skb
, void *data
),
78 extern int netlink_set_err(struct sock
*ssk
, __u32 portid
, __u32 group
, int code
);
79 extern int netlink_register_notifier(struct notifier_block
*nb
);
80 extern int netlink_unregister_notifier(struct notifier_block
*nb
);
82 /* finegrained unicast helpers: */
83 struct sock
*netlink_getsockbyfilp(struct file
*filp
);
84 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
,
85 long *timeo
, struct sock
*ssk
);
86 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
);
87 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
);
89 static inline struct sk_buff
*
90 netlink_skb_clone(struct sk_buff
*skb
, gfp_t gfp_mask
)
94 nskb
= skb_clone(skb
, gfp_mask
);
98 /* This is a large skb, set destructor callback to release head */
99 if (is_vmalloc_addr(skb
->head
))
100 nskb
->destructor
= skb
->destructor
;
106 * skb should fit one page. This choice is good for headerless malloc.
107 * But we should limit to 8K so that userspace does not have to
108 * use enormous buffer sizes on recvmsg() calls just to avoid
109 * MSG_TRUNC when PAGE_SIZE is very large.
111 #if PAGE_SIZE < 8192UL
112 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
114 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
117 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
120 struct netlink_callback
{
122 const struct nlmsghdr
*nlh
;
123 int (*dump
)(struct sk_buff
* skb
,
124 struct netlink_callback
*cb
);
125 int (*done
)(struct netlink_callback
*cb
);
127 /* the module that dump function belong to */
128 struct module
*module
;
131 unsigned int prev_seq
, seq
;
135 struct netlink_notify
{
142 __nlmsg_put(struct sk_buff
*skb
, u32 portid
, u32 seq
, int type
, int len
, int flags
);
144 struct netlink_dump_control
{
145 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*);
146 int (*done
)(struct netlink_callback
*);
148 struct module
*module
;
152 extern int __netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
153 const struct nlmsghdr
*nlh
,
154 struct netlink_dump_control
*control
);
155 static inline int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
156 const struct nlmsghdr
*nlh
,
157 struct netlink_dump_control
*control
)
159 if (!control
->module
)
160 control
->module
= THIS_MODULE
;
162 return __netlink_dump_start(ssk
, skb
, nlh
, control
);
166 struct net_device
*dev
;
167 struct module
*module
;
168 struct list_head list
;
171 extern int netlink_add_tap(struct netlink_tap
*nt
);
172 extern int netlink_remove_tap(struct netlink_tap
*nt
);
174 bool __netlink_ns_capable(const struct netlink_skb_parms
*nsp
,
175 struct user_namespace
*ns
, int cap
);
176 bool netlink_ns_capable(const struct sk_buff
*skb
,
177 struct user_namespace
*ns
, int cap
);
178 bool netlink_capable(const struct sk_buff
*skb
, int cap
);
179 bool netlink_net_capable(const struct sk_buff
*skb
, int cap
);
181 #endif /* __LINUX_NETLINK_H */
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