1#ifndef __LINUX_NETLINK_H
2#define __LINUX_NETLINK_H
3
4#define NETLINK_ROUTE		0	/* Routing/device hook				*/
5#define NETLINK_SKIP		1	/* Reserved for ENskip  			*/
6#define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
7#define NETLINK_FIREWALL	3	/* Firewalling hook				*/
8#define NETLINK_TCPDIAG		4	/* TCP socket monitoring			*/
9#define NETLINK_NFLOG		5	/* netfilter/iptables ULOG */
10#define NETLINK_ARPD		8
11#define NETLINK_ROUTE6		11	/* af_inet6 route comm channel */
12#define NETLINK_IP6_FW		13
13#define NETLINK_DNRTMSG		14	/* DECnet routing messages */
14#define NETLINK_TAPBASE		16	/* 16 to 31 are ethertap */
15
16#define MAX_LINKS 32
17
18struct sockaddr_nl
19{
20	sa_family_t	nl_family;	/* AF_NETLINK	*/
21	unsigned short	nl_pad;		/* zero		*/
22	__u32		nl_pid;		/* process pid	*/
23       	__u32		nl_groups;	/* multicast groups mask */
24};
25
26struct nlmsghdr
27{
28	__u32		nlmsg_len;	/* Length of message including header */
29	__u16		nlmsg_type;	/* Message content */
30	__u16		nlmsg_flags;	/* Additional flags */
31	__u32		nlmsg_seq;	/* Sequence number */
32	__u32		nlmsg_pid;	/* Sending process PID */
33};
34
35/* Flags values */
36
37#define NLM_F_REQUEST		1	/* It is request message. 	*/
38#define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
39#define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
40#define NLM_F_ECHO		8	/* Echo this request 		*/
41
42/* Modifiers to GET request */
43#define NLM_F_ROOT	0x100	/* specify tree	root	*/
44#define NLM_F_MATCH	0x200	/* return all matching	*/
45#define NLM_F_ATOMIC	0x400	/* atomic GET		*/
46#define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
47
48/* Modifiers to NEW request */
49#define NLM_F_REPLACE	0x100	/* Override existing		*/
50#define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
51#define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
52#define NLM_F_APPEND	0x800	/* Add to end of list		*/
53
54/*
55   4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
56   4.4BSD CHANGE	NLM_F_REPLACE
57
58   True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
59   Append		NLM_F_CREATE
60   Check		NLM_F_EXCL
61 */
62
63#define NLMSG_ALIGNTO	4
64#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
65#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
66#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
67#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
68#define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
69				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
70#define NLMSG_OK(nlh,len) ((len) > 0 && (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
71			   (nlh)->nlmsg_len <= (len))
72#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
73
74#define NLMSG_NOOP		0x1	/* Nothing.		*/
75#define NLMSG_ERROR		0x2	/* Error		*/
76#define NLMSG_DONE		0x3	/* End of a dump	*/
77#define NLMSG_OVERRUN		0x4	/* Data lost		*/
78
79struct nlmsgerr
80{
81	int		error;
82	struct nlmsghdr msg;
83};
84
85#define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
86
87#ifdef __KERNEL__
88
89struct netlink_skb_parms
90{
91	struct ucred		creds;		/* Skb credentials	*/
92	__u32			pid;
93	__u32			groups;
94	__u32			dst_pid;
95	__u32			dst_groups;
96	kernel_cap_t		eff_cap;
97};
98
99#define NETLINK_CB(skb)		(*(struct netlink_skb_parms*)&((skb)->cb))
100#define NETLINK_CREDS(skb)	(&NETLINK_CB((skb)).creds)
101
102
103extern int netlink_attach(int unit, int (*function)(int,struct sk_buff *skb));
104extern void netlink_detach(int unit);
105extern int netlink_post(int unit, struct sk_buff *skb);
106extern int init_netlink(void);
107extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len));
108extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
109extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
110extern void netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
111			      __u32 group, int allocation);
112extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
113extern int netlink_register_notifier(struct notifier_block *nb);
114extern int netlink_unregister_notifier(struct notifier_block *nb);
115
116#define NLMSG_GOODSIZE (PAGE_SIZE - ((sizeof(struct sk_buff)+0xF)&~0xF))
117
118
119struct netlink_callback
120{
121	struct sk_buff	*skb;
122	struct nlmsghdr	*nlh;
123	int		(*dump)(struct sk_buff * skb, struct netlink_callback *cb);
124	int		(*done)(struct netlink_callback *cb);
125	int		family;
126	long		args[4];
127};
128
129struct netlink_notify
130{
131	int pid;
132	int protocol;
133};
134
135static __inline__ struct nlmsghdr *
136__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len)
137{
138	struct nlmsghdr *nlh;
139	int size = NLMSG_LENGTH(len);
140
141	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
142	nlh->nlmsg_type = type;
143	nlh->nlmsg_len = size;
144	nlh->nlmsg_flags = 0;
145	nlh->nlmsg_pid = pid;
146	nlh->nlmsg_seq = seq;
147	return nlh;
148}
149
150#define NLMSG_PUT(skb, pid, seq, type, len) \
151({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \
152   __nlmsg_put(skb, pid, seq, type, len); })
153
154extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
155			      struct nlmsghdr *nlh,
156			      int (*dump)(struct sk_buff *skb, struct netlink_callback*),
157			      int (*done)(struct netlink_callback*));
158
159#define NL_NONROOT_RECV 0x1
160#define NL_NONROOT_SEND 0x2
161extern void netlink_set_nonroot(int protocol, unsigned flag);
162
163
164#endif /* __KERNEL__ */
165
166#endif	/* __LINUX_NETLINK_H */
167