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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 | 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 | }; |
23 | |
24 | struct 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 | |
36 | extern void netlink_table_grab(void); |
37 | extern 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 */ |
43 | struct 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 | bool (*compare)(struct net *net, struct sock *sk); |
50 | }; |
51 | |
52 | extern struct sock *__netlink_kernel_create(struct net *net, int unit, |
53 | struct module *module, |
54 | struct netlink_kernel_cfg *cfg); |
55 | static inline struct sock * |
56 | netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg) |
57 | { |
58 | return __netlink_kernel_create(net, unit, THIS_MODULE, cfg); |
59 | } |
60 | |
61 | extern void netlink_kernel_release(struct sock *sk); |
62 | extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); |
63 | extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); |
64 | extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
65 | extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
66 | extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); |
67 | extern int netlink_has_listeners(struct sock *sk, unsigned int group); |
68 | extern struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size, |
69 | u32 dst_portid, gfp_t gfp_mask); |
70 | extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock); |
71 | extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid, |
72 | __u32 group, gfp_t allocation); |
73 | extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, |
74 | __u32 portid, __u32 group, gfp_t allocation, |
75 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
76 | void *filter_data); |
77 | extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code); |
78 | extern int netlink_register_notifier(struct notifier_block *nb); |
79 | extern int netlink_unregister_notifier(struct notifier_block *nb); |
80 | |
81 | /* finegrained unicast helpers: */ |
82 | struct sock *netlink_getsockbyfilp(struct file *filp); |
83 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
84 | long *timeo, struct sock *ssk); |
85 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb); |
86 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb); |
87 | |
88 | static inline struct sk_buff * |
89 | netlink_skb_clone(struct sk_buff *skb, gfp_t gfp_mask) |
90 | { |
91 | struct sk_buff *nskb; |
92 | |
93 | nskb = skb_clone(skb, gfp_mask); |
94 | if (!nskb) |
95 | return NULL; |
96 | |
97 | /* This is a large skb, set destructor callback to release head */ |
98 | if (is_vmalloc_addr(skb->head)) |
99 | nskb->destructor = skb->destructor; |
100 | |
101 | return nskb; |
102 | } |
103 | |
104 | /* |
105 | * skb should fit one page. This choice is good for headerless malloc. |
106 | * But we should limit to 8K so that userspace does not have to |
107 | * use enormous buffer sizes on recvmsg() calls just to avoid |
108 | * MSG_TRUNC when PAGE_SIZE is very large. |
109 | */ |
110 | #if PAGE_SIZE < 8192UL |
111 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) |
112 | #else |
113 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) |
114 | #endif |
115 | |
116 | #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) |
117 | |
118 | |
119 | struct netlink_callback { |
120 | struct sk_buff *skb; |
121 | const struct nlmsghdr *nlh; |
122 | int (*dump)(struct sk_buff * skb, |
123 | struct netlink_callback *cb); |
124 | int (*done)(struct netlink_callback *cb); |
125 | void *data; |
126 | /* the module that dump function belong to */ |
127 | struct module *module; |
128 | u16 family; |
129 | u16 min_dump_alloc; |
130 | unsigned int prev_seq, seq; |
131 | long args[6]; |
132 | }; |
133 | |
134 | struct netlink_notify { |
135 | struct net *net; |
136 | int portid; |
137 | int protocol; |
138 | }; |
139 | |
140 | struct nlmsghdr * |
141 | __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags); |
142 | |
143 | struct netlink_dump_control { |
144 | int (*dump)(struct sk_buff *skb, struct netlink_callback *); |
145 | int (*done)(struct netlink_callback *); |
146 | void *data; |
147 | struct module *module; |
148 | u16 min_dump_alloc; |
149 | }; |
150 | |
151 | extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
152 | const struct nlmsghdr *nlh, |
153 | struct netlink_dump_control *control); |
154 | static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
155 | const struct nlmsghdr *nlh, |
156 | struct netlink_dump_control *control) |
157 | { |
158 | if (!control->module) |
159 | control->module = THIS_MODULE; |
160 | |
161 | return __netlink_dump_start(ssk, skb, nlh, control); |
162 | } |
163 | |
164 | struct netlink_tap { |
165 | struct net_device *dev; |
166 | struct module *module; |
167 | struct list_head list; |
168 | }; |
169 | |
170 | extern int netlink_add_tap(struct netlink_tap *nt); |
171 | extern int __netlink_remove_tap(struct netlink_tap *nt); |
172 | extern int netlink_remove_tap(struct netlink_tap *nt); |
173 | |
174 | #endif /* __LINUX_NETLINK_H */ |
175 |
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