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,
20 NETLINK_SKB_TX = 0x2,
21 NETLINK_SKB_DELIVERED = 0x4,
22 NETLINK_SKB_DST = 0x8,
23};
24
25struct netlink_skb_parms {
26 struct scm_creds creds;
27 __u32 portid;
28 __u32 dst_group;
29 __u32 flags;
30 struct sock *sk;
31 bool nsid_is_set;
32 int nsid;
33};
34
35#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
36#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
37
38
39extern void netlink_table_grab(void);
40extern void netlink_table_ungrab(void);
41
42#define NL_CFG_F_NONROOT_RECV (1 << 0)
43#define NL_CFG_F_NONROOT_SEND (1 << 1)
44
45
46struct netlink_kernel_cfg {
47 unsigned int groups;
48 unsigned int flags;
49 void (*input)(struct sk_buff *skb);
50 struct mutex *cb_mutex;
51 int (*bind)(int group);
52 void (*unbind)(int group);
53 bool (*compare)(struct net *net, struct sock *sk);
54};
55
56extern struct sock *__netlink_kernel_create(struct net *net, int unit,
57 struct module *module,
58 struct netlink_kernel_cfg *cfg);
59static inline struct sock *
60netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
61{
62 return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
63}
64
65extern void netlink_kernel_release(struct sock *sk);
66extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
67extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
68extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
69extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
70extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
71extern int netlink_has_listeners(struct sock *sk, unsigned int group);
72extern struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size,
73 u32 dst_portid, gfp_t gfp_mask);
74extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
75extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid,
76 __u32 group, gfp_t allocation);
77extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
78 __u32 portid, __u32 group, gfp_t allocation,
79 int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
80 void *filter_data);
81extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code);
82extern int netlink_register_notifier(struct notifier_block *nb);
83extern int netlink_unregister_notifier(struct notifier_block *nb);
84
85
86struct sock *netlink_getsockbyfilp(struct file *filp);
87int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
88 long *timeo, struct sock *ssk);
89void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
90int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
91
92static inline struct sk_buff *
93netlink_skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
94{
95 struct sk_buff *nskb;
96
97 nskb = skb_clone(skb, gfp_mask);
98 if (!nskb)
99 return NULL;
100
101
102 if (is_vmalloc_addr(skb->head))
103 nskb->destructor = skb->destructor;
104
105 return nskb;
106}
107
108
109
110
111
112
113
114#if PAGE_SIZE < 8192UL
115#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
116#else
117#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
118#endif
119
120#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
121
122
123struct netlink_callback {
124 struct sk_buff *skb;
125 const struct nlmsghdr *nlh;
126 int (*dump)(struct sk_buff * skb,
127 struct netlink_callback *cb);
128 int (*done)(struct netlink_callback *cb);
129 void *data;
130
131 struct module *module;
132 u16 family;
133 u16 min_dump_alloc;
134 unsigned int prev_seq, seq;
135 long args[6];
136};
137
138struct netlink_notify {
139 struct net *net;
140 int portid;
141 int protocol;
142};
143
144struct nlmsghdr *
145__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags);
146
147struct netlink_dump_control {
148 int (*dump)(struct sk_buff *skb, struct netlink_callback *);
149 int (*done)(struct netlink_callback *);
150 void *data;
151 struct module *module;
152 u16 min_dump_alloc;
153};
154
155extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
156 const struct nlmsghdr *nlh,
157 struct netlink_dump_control *control);
158static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
159 const struct nlmsghdr *nlh,
160 struct netlink_dump_control *control)
161{
162 if (!control->module)
163 control->module = THIS_MODULE;
164
165 return __netlink_dump_start(ssk, skb, nlh, control);
166}
167
168struct netlink_tap {
169 struct net_device *dev;
170 struct module *module;
171 struct list_head list;
172};
173
174extern int netlink_add_tap(struct netlink_tap *nt);
175extern int __netlink_remove_tap(struct netlink_tap *nt);
176extern int netlink_remove_tap(struct netlink_tap *nt);
177
178bool __netlink_ns_capable(const struct netlink_skb_parms *nsp,
179 struct user_namespace *ns, int cap);
180bool netlink_ns_capable(const struct sk_buff *skb,
181 struct user_namespace *ns, int cap);
182bool netlink_capable(const struct sk_buff *skb, int cap);
183bool netlink_net_capable(const struct sk_buff *skb, int cap);
184
185#endif
186