Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef __LINUX_NETLINK_H |
2 | #define __LINUX_NETLINK_H | |
3 | ||
1da177e4 LT |
4 | |
5 | #include <linux/capability.h> | |
6 | #include <linux/skbuff.h> | |
abb17e6c | 7 | #include <linux/export.h> |
dbe9a417 | 8 | #include <net/scm.h> |
607ca46e | 9 | #include <uapi/linux/netlink.h> |
1da177e4 | 10 | |
56b49f4b OW |
11 | struct net; |
12 | ||
b529ccf2 ACM |
13 | static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) |
14 | { | |
15 | return (struct nlmsghdr *)skb->data; | |
16 | } | |
17 | ||
d94d9fee | 18 | struct netlink_skb_parms { |
dbe9a417 | 19 | struct scm_creds creds; /* Skb credentials */ |
15e47304 | 20 | __u32 portid; |
d629b836 | 21 | __u32 dst_group; |
3fbc2905 | 22 | struct sock *ssk; |
1da177e4 LT |
23 | }; |
24 | ||
25 | #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) | |
26 | #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) | |
27 | ||
28 | ||
d136f1bd JB |
29 | extern void netlink_table_grab(void); |
30 | extern void netlink_table_ungrab(void); | |
31 | ||
9785e10a PNA |
32 | #define NL_CFG_F_NONROOT_RECV (1 << 0) |
33 | #define NL_CFG_F_NONROOT_SEND (1 << 1) | |
34 | ||
a31f2d17 PNA |
35 | /* optional Netlink kernel configuration parameters */ |
36 | struct netlink_kernel_cfg { | |
37 | unsigned int groups; | |
c9d2ea96 | 38 | unsigned int flags; |
a31f2d17 PNA |
39 | void (*input)(struct sk_buff *skb); |
40 | struct mutex *cb_mutex; | |
03292745 | 41 | void (*bind)(int group); |
a31f2d17 PNA |
42 | }; |
43 | ||
9f00d977 PNA |
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 | ||
b7c6ba6e | 53 | extern void netlink_kernel_release(struct sock *sk); |
d136f1bd | 54 | extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); |
b4ff4f04 | 55 | extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); |
b8273570 | 56 | extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
84659eb5 | 57 | extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
1da177e4 | 58 | extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); |
4277a083 | 59 | extern int netlink_has_listeners(struct sock *sk, unsigned int group); |
15e47304 EB |
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, | |
dd0fc66f | 62 | __u32 group, gfp_t allocation); |
910a7e90 | 63 | extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, |
15e47304 | 64 | __u32 portid, __u32 group, gfp_t allocation, |
910a7e90 EB |
65 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
66 | void *filter_data); | |
15e47304 | 67 | extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code); |
1da177e4 LT |
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); | |
9457afee | 73 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
c3d8d1e3 | 74 | long *timeo, struct sock *ssk); |
1da177e4 | 75 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb); |
7ee015e0 | 76 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
77 | |
78 | /* | |
79 | * skb should fit one page. This choice is good for headerless malloc. | |
fc910a27 DM |
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. | |
1da177e4 | 83 | */ |
fc910a27 DM |
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 | ||
339bf98f | 90 | #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) |
1da177e4 LT |
91 | |
92 | ||
d94d9fee | 93 | struct netlink_callback { |
3a6c2b41 PM |
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); | |
7175c883 | 99 | void *data; |
6dc878a8 G |
100 | /* the module that dump function belong to */ |
101 | struct module *module; | |
c7ac8679 GR |
102 | u16 family; |
103 | u16 min_dump_alloc; | |
670dc283 | 104 | unsigned int prev_seq, seq; |
3a6c2b41 | 105 | long args[6]; |
1da177e4 LT |
106 | }; |
107 | ||
d94d9fee | 108 | struct netlink_notify { |
b4b51029 | 109 | struct net *net; |
15e47304 | 110 | int portid; |
1da177e4 LT |
111 | int protocol; |
112 | }; | |
113 | ||
a46621a3 | 114 | struct nlmsghdr * |
15e47304 | 115 | __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags); |
1da177e4 | 116 | |
80d326fa PNA |
117 | struct netlink_dump_control { |
118 | int (*dump)(struct sk_buff *skb, struct netlink_callback *); | |
6dc878a8 | 119 | int (*done)(struct netlink_callback *); |
7175c883 | 120 | void *data; |
6dc878a8 | 121 | struct module *module; |
80d326fa PNA |
122 | u16 min_dump_alloc; |
123 | }; | |
124 | ||
6dc878a8 G |
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 | } | |
1da177e4 | 137 | |
1da177e4 | 138 | #endif /* __LINUX_NETLINK_H */ |