1#ifndef __LINUX_NETLINK_H
2#define __LINUX_NETLINK_H
3
4#include <linux/socket.h> /* for sa_family_t */
5#include <linux/types.h>
6
7#define NETLINK_ROUTE		0	/* Routing/device hook				*/
8#define NETLINK_UNUSED		1	/* Unused number				*/
9#define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
10#define NETLINK_FIREWALL	3	/* Firewalling hook				*/
11#define NETLINK_INET_DIAG	4	/* INET socket monitoring			*/
12#define NETLINK_NFLOG		5	/* netfilter/iptables ULOG */
13#define NETLINK_XFRM		6	/* ipsec */
14#define NETLINK_SELINUX		7	/* SELinux event notifications */
15#define NETLINK_ISCSI		8	/* Open-iSCSI */
16#define NETLINK_AUDIT		9	/* auditing */
17#define NETLINK_FIB_LOOKUP	10
18#define NETLINK_CONNECTOR	11
19#define NETLINK_NETFILTER	12	/* netfilter subsystem */
20#define NETLINK_IP6_FW		13
21#define NETLINK_DNRTMSG		14	/* DECnet routing messages */
22#define NETLINK_KOBJECT_UEVENT	15	/* Kernel messages to userspace */
23#define NETLINK_GENERIC		16
24/* leave room for NETLINK_DM (DM Events) */
25#define NETLINK_SCSITRANSPORT	18	/* SCSI Transports */
26#define NETLINK_ECRYPTFS	19
27
28#define MAX_LINKS 32
29
30struct sockaddr_nl
31{
32	sa_family_t	nl_family;	/* AF_NETLINK	*/
33	unsigned short	nl_pad;		/* zero		*/
34	__u32		nl_pid;		/* port ID	*/
35       	__u32		nl_groups;	/* multicast groups mask */
36};
37
38struct nlmsghdr
39{
40	__u32		nlmsg_len;	/* Length of message including header */
41	__u16		nlmsg_type;	/* Message content */
42	__u16		nlmsg_flags;	/* Additional flags */
43	__u32		nlmsg_seq;	/* Sequence number */
44	__u32		nlmsg_pid;	/* Sending process port ID */
45};
46
47/* Flags values */
48
49#define NLM_F_REQUEST		1	/* It is request message. 	*/
50#define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
51#define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
52#define NLM_F_ECHO		8	/* Echo this request 		*/
53
54/* Modifiers to GET request */
55#define NLM_F_ROOT	0x100	/* specify tree	root	*/
56#define NLM_F_MATCH	0x200	/* return all matching	*/
57#define NLM_F_ATOMIC	0x400	/* atomic GET		*/
58#define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
59
60/* Modifiers to NEW request */
61#define NLM_F_REPLACE	0x100	/* Override existing		*/
62#define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
63#define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
64#define NLM_F_APPEND	0x800	/* Add to end of list		*/
65
66/*
67   4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
68   4.4BSD CHANGE	NLM_F_REPLACE
69
70   True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
71   Append		NLM_F_CREATE
72   Check		NLM_F_EXCL
73 */
74
75#define NLMSG_ALIGNTO	4
76#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
77#define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
78#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
79#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
80#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
81#define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
82				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
83#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
84			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
85			   (nlh)->nlmsg_len <= (len))
86#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
87
88#define NLMSG_NOOP		0x1	/* Nothing.		*/
89#define NLMSG_ERROR		0x2	/* Error		*/
90#define NLMSG_DONE		0x3	/* End of a dump	*/
91#define NLMSG_OVERRUN		0x4	/* Data lost		*/
92
93#define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */
94
95struct nlmsgerr
96{
97	int		error;
98	struct nlmsghdr msg;
99};
100
101#define NETLINK_ADD_MEMBERSHIP	1
102#define NETLINK_DROP_MEMBERSHIP	2
103#define NETLINK_PKTINFO		3
104
105struct nl_pktinfo
106{
107	__u32	group;
108};
109
110#define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
111
112enum {
113	NETLINK_UNCONNECTED = 0,
114	NETLINK_CONNECTED,
115};
116
117/*
118 *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
119 * +---------------------+- - -+- - - - - - - - - -+- - -+
120 * |        Header       | Pad |     Payload       | Pad |
121 * |   (struct nlattr)   | ing |                   | ing |
122 * +---------------------+- - -+- - - - - - - - - -+- - -+
123 *  <-------------- nlattr->nla_len -------------->
124 */
125
126struct nlattr
127{
128	__u16           nla_len;
129	__u16           nla_type;
130};
131
132#define NLA_ALIGNTO		4
133#define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
134#define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
135
136#ifdef __KERNEL__
137
138#include <linux/capability.h>
139#include <linux/skbuff.h>
140
141static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
142{
143	return (struct nlmsghdr *)skb->data;
144}
145
146struct netlink_skb_parms
147{
148	struct ucred		creds;		/* Skb credentials	*/
149	__u32			pid;
150	__u32			dst_group;
151	kernel_cap_t		eff_cap;
152	__u32			loginuid;	/* Login (audit) uid */
153	__u32			sid;		/* SELinux security id */
154};
155
156#define NETLINK_CB(skb)		(*(struct netlink_skb_parms*)&((skb)->cb))
157#define NETLINK_CREDS(skb)	(&NETLINK_CB((skb)).creds)
158
159
160extern struct sock *netlink_kernel_create(int unit, unsigned int groups,
161					  void (*input)(struct sock *sk, int len),
162					  struct mutex *cb_mutex,
163					  struct module *module);
164extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
165extern int netlink_has_listeners(struct sock *sk, unsigned int group);
166extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
167extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
168			     __u32 group, gfp_t allocation);
169extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
170extern int netlink_register_notifier(struct notifier_block *nb);
171extern int netlink_unregister_notifier(struct notifier_block *nb);
172
173/* finegrained unicast helpers: */
174struct sock *netlink_getsockbyfilp(struct file *filp);
175int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
176		long timeo, struct sock *ssk);
177void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
178int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
179
180/*
181 *	skb should fit one page. This choice is good for headerless malloc.
182 *	But we should limit to 8K so that userspace does not have to
183 *	use enormous buffer sizes on recvmsg() calls just to avoid
184 *	MSG_TRUNC when PAGE_SIZE is very large.
185 */
186#if PAGE_SIZE < 8192UL
187#define NLMSG_GOODSIZE	SKB_WITH_OVERHEAD(PAGE_SIZE)
188#else
189#define NLMSG_GOODSIZE	SKB_WITH_OVERHEAD(8192UL)
190#endif
191
192#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
193
194
195struct netlink_callback
196{
197	struct sk_buff	*skb;
198	struct nlmsghdr	*nlh;
199	int		(*dump)(struct sk_buff * skb, struct netlink_callback *cb);
200	int		(*done)(struct netlink_callback *cb);
201	int		family;
202	long		args[5];
203};
204
205struct netlink_notify
206{
207	int pid;
208	int protocol;
209};
210
211static __inline__ struct nlmsghdr *
212__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
213{
214	struct nlmsghdr *nlh;
215	int size = NLMSG_LENGTH(len);
216
217	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
218	nlh->nlmsg_type = type;
219	nlh->nlmsg_len = size;
220	nlh->nlmsg_flags = flags;
221	nlh->nlmsg_pid = pid;
222	nlh->nlmsg_seq = seq;
223	memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
224	return nlh;
225}
226
227#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
228({	if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
229		goto nlmsg_failure; \
230	__nlmsg_put(skb, pid, seq, type, len, flags); })
231
232#define NLMSG_PUT(skb, pid, seq, type, len) \
233	NLMSG_NEW(skb, pid, seq, type, len, 0)
234
235extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
236			      struct nlmsghdr *nlh,
237			      int (*dump)(struct sk_buff *skb, struct netlink_callback*),
238			      int (*done)(struct netlink_callback*));
239
240
241#define NL_NONROOT_RECV 0x1
242#define NL_NONROOT_SEND 0x2
243extern void netlink_set_nonroot(int protocol, unsigned flag);
244
245#endif /* __KERNEL__ */
246
247#endif	/* __LINUX_NETLINK_H */
248