Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
11struct net;
12
13static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
14{
15 return (struct nlmsghdr *)skb->data;
16}
17
18enum 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};
23
24struct netlink_skb_parms {
25 struct scm_creds creds; /* Skb credentials */
26 __u32 portid;
27 __u32 dst_group;
28 __u32 flags;
29 struct sock *sk;
30};
31
32#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
33#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
34
35
36extern void netlink_table_grab(void);
37extern void netlink_table_ungrab(void);
38
39#define NL_CFG_F_NONROOT_RECV (1 << 0)
40#define NL_CFG_F_NONROOT_SEND (1 << 1)
41
42/* optional Netlink kernel configuration parameters */
43struct netlink_kernel_cfg {
44 unsigned int groups;
45 unsigned int flags;
46 void (*input)(struct sk_buff *skb);
47 struct mutex *cb_mutex;
48 void (*bind)(int group);
49};
50
51extern struct sock *__netlink_kernel_create(struct net *net, int unit,
52 struct module *module,
53 struct netlink_kernel_cfg *cfg);
54static inline struct sock *
55netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
56{
57 return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
58}
59
60extern void netlink_kernel_release(struct sock *sk);
61extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
62extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
63extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
64extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
65extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
66extern int netlink_has_listeners(struct sock *sk, unsigned int group);
67extern struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size,
68 u32 dst_portid, gfp_t gfp_mask);
69extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
70extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid,
71 __u32 group, gfp_t allocation);
72extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
73 __u32 portid, __u32 group, gfp_t allocation,
74 int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
75 void *filter_data);
76extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code);
77extern int netlink_register_notifier(struct notifier_block *nb);
78extern int netlink_unregister_notifier(struct notifier_block *nb);
79
80/* finegrained unicast helpers: */
81struct sock *netlink_getsockbyfilp(struct file *filp);
82int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
83 long *timeo, struct sock *ssk);
84void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
85int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
86
87/*
88 * skb should fit one page. This choice is good for headerless malloc.
89 * But we should limit to 8K so that userspace does not have to
90 * use enormous buffer sizes on recvmsg() calls just to avoid
91 * MSG_TRUNC when PAGE_SIZE is very large.
92 */
93#if PAGE_SIZE < 8192UL
94#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
95#else
96#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
97#endif
98
99#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
100
101
102struct netlink_callback {
103 struct sk_buff *skb;
104 const struct nlmsghdr *nlh;
105 int (*dump)(struct sk_buff * skb,
106 struct netlink_callback *cb);
107 int (*done)(struct netlink_callback *cb);
108 void *data;
109 /* the module that dump function belong to */
110 struct module *module;
111 u16 family;
112 u16 min_dump_alloc;
113 unsigned int prev_seq, seq;
114 long args[6];
115};
116
117struct netlink_notify {
118 struct net *net;
119 int portid;
120 int protocol;
121};
122
123struct nlmsghdr *
124__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags);
125
126struct netlink_dump_control {
127 int (*dump)(struct sk_buff *skb, struct netlink_callback *);
128 int (*done)(struct netlink_callback *);
129 void *data;
130 struct module *module;
131 u16 min_dump_alloc;
132};
133
134extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
135 const struct nlmsghdr *nlh,
136 struct netlink_dump_control *control);
137static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
138 const struct nlmsghdr *nlh,
139 struct netlink_dump_control *control)
140{
141 if (!control->module)
142 control->module = THIS_MODULE;
143
144 return __netlink_dump_start(ssk, skb, nlh, control);
145}
146
147#endif /* __LINUX_NETLINK_H */