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1 | #ifndef __LINUX_NETLINK_H |
2 | #define __LINUX_NETLINK_H |
3 | |
4 | |
5 | #include <linux/capability.h> |
6 | #include <linux/skbuff.h> |
7 | #include <linux/export.h> |
8 | #include <net/scm.h> |
9 | #include <uapi/linux/netlink.h> |
10 | |
11 | struct net; |
12 | |
13 | static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) |
14 | { |
15 | return (struct nlmsghdr *)skb->data; |
16 | } |
17 | |
18 | struct netlink_skb_parms { |
19 | struct scm_creds creds; /* Skb credentials */ |
20 | __u32 portid; |
21 | __u32 dst_group; |
22 | struct sock *ssk; |
23 | }; |
24 | |
25 | #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) |
26 | #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) |
27 | |
28 | |
29 | extern void netlink_table_grab(void); |
30 | extern void netlink_table_ungrab(void); |
31 | |
32 | #define NL_CFG_F_NONROOT_RECV (1 << 0) |
33 | #define NL_CFG_F_NONROOT_SEND (1 << 1) |
34 | |
35 | /* optional Netlink kernel configuration parameters */ |
36 | struct netlink_kernel_cfg { |
37 | unsigned int groups; |
38 | unsigned int flags; |
39 | void (*input)(struct sk_buff *skb); |
40 | struct mutex *cb_mutex; |
41 | void (*bind)(int group); |
42 | }; |
43 | |
44 | extern struct sock *__netlink_kernel_create(struct net *net, int unit, |
45 | struct module *module, |
46 | struct netlink_kernel_cfg *cfg); |
47 | static inline struct sock * |
48 | netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg) |
49 | { |
50 | return __netlink_kernel_create(net, unit, THIS_MODULE, cfg); |
51 | } |
52 | |
53 | extern void netlink_kernel_release(struct sock *sk); |
54 | extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); |
55 | extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); |
56 | extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
57 | extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
58 | extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); |
59 | extern int netlink_has_listeners(struct sock *sk, unsigned int group); |
60 | extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock); |
61 | extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid, |
62 | __u32 group, gfp_t allocation); |
63 | extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, |
64 | __u32 portid, __u32 group, gfp_t allocation, |
65 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
66 | void *filter_data); |
67 | extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code); |
68 | extern int netlink_register_notifier(struct notifier_block *nb); |
69 | extern int netlink_unregister_notifier(struct notifier_block *nb); |
70 | |
71 | /* finegrained unicast helpers: */ |
72 | struct sock *netlink_getsockbyfilp(struct file *filp); |
73 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
74 | long *timeo, struct sock *ssk); |
75 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb); |
76 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb); |
77 | |
78 | /* |
79 | * skb should fit one page. This choice is good for headerless malloc. |
80 | * But we should limit to 8K so that userspace does not have to |
81 | * use enormous buffer sizes on recvmsg() calls just to avoid |
82 | * MSG_TRUNC when PAGE_SIZE is very large. |
83 | */ |
84 | #if PAGE_SIZE < 8192UL |
85 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) |
86 | #else |
87 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) |
88 | #endif |
89 | |
90 | #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) |
91 | |
92 | |
93 | struct netlink_callback { |
94 | struct sk_buff *skb; |
95 | const struct nlmsghdr *nlh; |
96 | int (*dump)(struct sk_buff * skb, |
97 | struct netlink_callback *cb); |
98 | int (*done)(struct netlink_callback *cb); |
99 | void *data; |
100 | /* the module that dump function belong to */ |
101 | struct module *module; |
102 | u16 family; |
103 | u16 min_dump_alloc; |
104 | unsigned int prev_seq, seq; |
105 | long args[6]; |
106 | }; |
107 | |
108 | struct netlink_notify { |
109 | struct net *net; |
110 | int portid; |
111 | int protocol; |
112 | }; |
113 | |
114 | struct nlmsghdr * |
115 | __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags); |
116 | |
117 | struct netlink_dump_control { |
118 | int (*dump)(struct sk_buff *skb, struct netlink_callback *); |
119 | int (*done)(struct netlink_callback *); |
120 | void *data; |
121 | struct module *module; |
122 | u16 min_dump_alloc; |
123 | }; |
124 | |
125 | extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
126 | const struct nlmsghdr *nlh, |
127 | struct netlink_dump_control *control); |
128 | static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
129 | const struct nlmsghdr *nlh, |
130 | struct netlink_dump_control *control) |
131 | { |
132 | if (!control->module) |
133 | control->module = THIS_MODULE; |
134 | |
135 | return __netlink_dump_start(ssk, skb, nlh, control); |
136 | } |
137 | |
138 | #endif /* __LINUX_NETLINK_H */ |
139 |
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