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git.proxmox.com Git - mirror_ubuntu-zesty-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
);
65 extern void netlink_kernel_release(struct sock
*sk
);
66 extern int __netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
67 extern int netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
68 extern void __netlink_clear_multicast_users(struct sock
*sk
, unsigned int group
);
69 extern void netlink_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
);
70 extern int netlink_has_listeners(struct sock
*sk
, unsigned int group
);
72 extern struct sk_buff
*__netlink_alloc_skb(struct sock
*ssk
, unsigned int size
,
73 unsigned int ldiff
, u32 dst_portid
,
75 static inline struct sk_buff
*
76 netlink_alloc_skb(struct sock
*ssk
, unsigned int size
, u32 dst_portid
,
79 return __netlink_alloc_skb(ssk
, size
, 0, dst_portid
, gfp_mask
);
82 extern int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 portid
, int nonblock
);
83 extern int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 portid
,
84 __u32 group
, gfp_t allocation
);
85 extern int netlink_broadcast_filtered(struct sock
*ssk
, struct sk_buff
*skb
,
86 __u32 portid
, __u32 group
, gfp_t allocation
,
87 int (*filter
)(struct sock
*dsk
, struct sk_buff
*skb
, void *data
),
89 extern int netlink_set_err(struct sock
*ssk
, __u32 portid
, __u32 group
, int code
);
90 extern int netlink_register_notifier(struct notifier_block
*nb
);
91 extern int netlink_unregister_notifier(struct notifier_block
*nb
);
93 /* finegrained unicast helpers: */
94 struct sock
*netlink_getsockbyfilp(struct file
*filp
);
95 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
,
96 long *timeo
, struct sock
*ssk
);
97 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
);
98 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
);
100 static inline struct sk_buff
*
101 netlink_skb_clone(struct sk_buff
*skb
, gfp_t gfp_mask
)
103 struct sk_buff
*nskb
;
105 nskb
= skb_clone(skb
, gfp_mask
);
109 /* This is a large skb, set destructor callback to release head */
110 if (is_vmalloc_addr(skb
->head
))
111 nskb
->destructor
= skb
->destructor
;
117 * skb should fit one page. This choice is good for headerless malloc.
118 * But we should limit to 8K so that userspace does not have to
119 * use enormous buffer sizes on recvmsg() calls just to avoid
120 * MSG_TRUNC when PAGE_SIZE is very large.
122 #if PAGE_SIZE < 8192UL
123 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
125 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
128 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
131 struct netlink_callback
{
133 const struct nlmsghdr
*nlh
;
134 int (*dump
)(struct sk_buff
* skb
,
135 struct netlink_callback
*cb
);
136 int (*done
)(struct netlink_callback
*cb
);
138 /* the module that dump function belong to */
139 struct module
*module
;
142 unsigned int prev_seq
, seq
;
146 struct netlink_notify
{
153 __nlmsg_put(struct sk_buff
*skb
, u32 portid
, u32 seq
, int type
, int len
, int flags
);
155 struct netlink_dump_control
{
156 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*);
157 int (*done
)(struct netlink_callback
*);
159 struct module
*module
;
163 extern int __netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
164 const struct nlmsghdr
*nlh
,
165 struct netlink_dump_control
*control
);
166 static inline int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
167 const struct nlmsghdr
*nlh
,
168 struct netlink_dump_control
*control
)
170 if (!control
->module
)
171 control
->module
= THIS_MODULE
;
173 return __netlink_dump_start(ssk
, skb
, nlh
, control
);
177 struct net_device
*dev
;
178 struct module
*module
;
179 struct list_head list
;
182 extern int netlink_add_tap(struct netlink_tap
*nt
);
183 extern int netlink_remove_tap(struct netlink_tap
*nt
);
185 bool __netlink_ns_capable(const struct netlink_skb_parms
*nsp
,
186 struct user_namespace
*ns
, int cap
);
187 bool netlink_ns_capable(const struct sk_buff
*skb
,
188 struct user_namespace
*ns
, int cap
);
189 bool netlink_capable(const struct sk_buff
*skb
, int cap
);
190 bool netlink_net_capable(const struct sk_buff
*skb
, int cap
);
192 #endif /* __LINUX_NETLINK_H */