1 #ifndef __LINUX_NETLINK_H
2 #define __LINUX_NETLINK_H
4 #include <linux/socket.h> /* for sa_family_t */
5 #include <linux/types.h>
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
33 sa_family_t nl_family
; /* AF_NETLINK */
34 unsigned short nl_pad
; /* zero */
35 __u32 nl_pid
; /* port ID */
36 __u32 nl_groups
; /* multicast groups mask */
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 */
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 */
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)
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 */
67 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
68 4.4BSD CHANGE NLM_F_REPLACE
70 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
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)))
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 */
93 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
100 #define NETLINK_ADD_MEMBERSHIP 1
101 #define NETLINK_DROP_MEMBERSHIP 2
102 #define NETLINK_PKTINFO 3
103 #define NETLINK_BROADCAST_ERROR 4
104 #define NETLINK_NO_ENOBUFS 5
110 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
113 NETLINK_UNCONNECTED
= 0,
118 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
119 * +---------------------+- - -+- - - - - - - - - -+- - -+
120 * | Header | Pad | Payload | Pad |
121 * | (struct nlattr) | ing | | ing |
122 * +---------------------+- - -+- - - - - - - - - -+- - -+
123 * <-------------- nlattr->nla_len -------------->
133 * +---+---+-------------------------------+
134 * | N | O | Attribute Type |
135 * +---+---+-------------------------------+
136 * N := Carries nested attributes
137 * O := Payload stored in network byte order
139 * Note: The N and O flag are mutually exclusive.
141 #define NLA_F_NESTED (1 << 15)
142 #define NLA_F_NET_BYTEORDER (1 << 14)
143 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
145 #define NLA_ALIGNTO 4
146 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
147 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
151 #include <linux/capability.h>
152 #include <linux/skbuff.h>
154 static inline struct nlmsghdr
*nlmsg_hdr(const struct sk_buff
*skb
)
156 return (struct nlmsghdr
*)skb
->data
;
159 struct netlink_skb_parms
{
160 struct ucred creds
; /* Skb credentials */
163 kernel_cap_t eff_cap
;
164 __u32 loginuid
; /* Login (audit) uid */
165 __u32 sessionid
; /* Session id (audit) */
166 __u32 sid
; /* SELinux security id */
169 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
170 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
173 extern void netlink_table_grab(void);
174 extern void netlink_table_ungrab(void);
176 extern struct sock
*netlink_kernel_create(struct net
*net
,
177 int unit
,unsigned int groups
,
178 void (*input
)(struct sk_buff
*skb
),
179 struct mutex
*cb_mutex
,
180 struct module
*module
);
181 extern void netlink_kernel_release(struct sock
*sk
);
182 extern int __netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
183 extern int netlink_change_ngroups(struct sock
*sk
, unsigned int groups
);
184 extern void __netlink_clear_multicast_users(struct sock
*sk
, unsigned int group
);
185 extern void netlink_clear_multicast_users(struct sock
*sk
, unsigned int group
);
186 extern void netlink_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
);
187 extern int netlink_has_listeners(struct sock
*sk
, unsigned int group
);
188 extern int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
, int nonblock
);
189 extern int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
,
190 __u32 group
, gfp_t allocation
);
191 extern int netlink_broadcast_filtered(struct sock
*ssk
, struct sk_buff
*skb
,
192 __u32 pid
, __u32 group
, gfp_t allocation
,
193 int (*filter
)(struct sock
*dsk
, struct sk_buff
*skb
, void *data
),
195 extern int netlink_set_err(struct sock
*ssk
, __u32 pid
, __u32 group
, int code
);
196 extern int netlink_register_notifier(struct notifier_block
*nb
);
197 extern int netlink_unregister_notifier(struct notifier_block
*nb
);
199 /* finegrained unicast helpers: */
200 struct sock
*netlink_getsockbyfilp(struct file
*filp
);
201 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
,
202 long *timeo
, struct sock
*ssk
);
203 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
);
204 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
);
207 * skb should fit one page. This choice is good for headerless malloc.
208 * But we should limit to 8K so that userspace does not have to
209 * use enormous buffer sizes on recvmsg() calls just to avoid
210 * MSG_TRUNC when PAGE_SIZE is very large.
212 #if PAGE_SIZE < 8192UL
213 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
215 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
218 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
221 struct netlink_callback
{
223 const struct nlmsghdr
*nlh
;
224 int (*dump
)(struct sk_buff
* skb
,
225 struct netlink_callback
*cb
);
226 int (*done
)(struct netlink_callback
*cb
);
231 struct netlink_notify
{
237 static __inline__
struct nlmsghdr
*
238 __nlmsg_put(struct sk_buff
*skb
, u32 pid
, u32 seq
, int type
, int len
, int flags
)
240 struct nlmsghdr
*nlh
;
241 int size
= NLMSG_LENGTH(len
);
243 nlh
= (struct nlmsghdr
*)skb_put(skb
, NLMSG_ALIGN(size
));
244 nlh
->nlmsg_type
= type
;
245 nlh
->nlmsg_len
= size
;
246 nlh
->nlmsg_flags
= flags
;
247 nlh
->nlmsg_pid
= pid
;
248 nlh
->nlmsg_seq
= seq
;
249 if (!__builtin_constant_p(size
) || NLMSG_ALIGN(size
) - size
!= 0)
250 memset(NLMSG_DATA(nlh
) + len
, 0, NLMSG_ALIGN(size
) - size
);
254 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
255 ({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
256 goto nlmsg_failure; \
257 __nlmsg_put(skb, pid, seq, type, len, flags); })
259 #define NLMSG_PUT(skb, pid, seq, type, len) \
260 NLMSG_NEW(skb, pid, seq, type, len, 0)
262 extern int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
263 const struct nlmsghdr
*nlh
,
264 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*),
265 int (*done
)(struct netlink_callback
*));
268 #define NL_NONROOT_RECV 0x1
269 #define NL_NONROOT_SEND 0x2
270 extern void netlink_set_nonroot(int protocol
, unsigned flag
);
272 #endif /* __KERNEL__ */
274 #endif /* __LINUX_NETLINK_H */
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