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
34 sa_family_t nl_family
; /* AF_NETLINK */
35 unsigned short nl_pad
; /* zero */
36 __u32 nl_pid
; /* port ID */
37 __u32 nl_groups
; /* multicast groups mask */
42 __u32 nlmsg_len
; /* Length of message including header */
43 __u16 nlmsg_type
; /* Message content */
44 __u16 nlmsg_flags
; /* Additional flags */
45 __u32 nlmsg_seq
; /* Sequence number */
46 __u32 nlmsg_pid
; /* Sending process port ID */
51 #define NLM_F_REQUEST 1 /* It is request message. */
52 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
53 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
54 #define NLM_F_ECHO 8 /* Echo this request */
56 /* Modifiers to GET request */
57 #define NLM_F_ROOT 0x100 /* specify tree root */
58 #define NLM_F_MATCH 0x200 /* return all matching */
59 #define NLM_F_ATOMIC 0x400 /* atomic GET */
60 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
62 /* Modifiers to NEW request */
63 #define NLM_F_REPLACE 0x100 /* Override existing */
64 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
65 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
66 #define NLM_F_APPEND 0x800 /* Add to end of list */
69 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
70 4.4BSD CHANGE NLM_F_REPLACE
72 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
77 #define NLMSG_ALIGNTO 4
78 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
79 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
80 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
81 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
82 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
83 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
84 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
85 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
86 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
87 (nlh)->nlmsg_len <= (len))
88 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
90 #define NLMSG_NOOP 0x1 /* Nothing. */
91 #define NLMSG_ERROR 0x2 /* Error */
92 #define NLMSG_DONE 0x3 /* End of a dump */
93 #define NLMSG_OVERRUN 0x4 /* Data lost */
95 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
103 #define NETLINK_ADD_MEMBERSHIP 1
104 #define NETLINK_DROP_MEMBERSHIP 2
105 #define NETLINK_PKTINFO 3
112 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
115 NETLINK_UNCONNECTED
= 0,
120 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
121 * +---------------------+- - -+- - - - - - - - - -+- - -+
122 * | Header | Pad | Payload | Pad |
123 * | (struct nlattr) | ing | | ing |
124 * +---------------------+- - -+- - - - - - - - - -+- - -+
125 * <-------------- nlattr->nla_len -------------->
136 * +---+---+-------------------------------+
137 * | N | O | Attribute Type |
138 * +---+---+-------------------------------+
139 * N := Carries nested attributes
140 * O := Payload stored in network byte order
142 * Note: The N and O flag are mutually exclusive.
144 #define NLA_F_NESTED (1 << 15)
145 #define NLA_F_NET_BYTEORDER (1 << 14)
146 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
148 #define NLA_ALIGNTO 4
149 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
150 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
154 #include <linux/capability.h>
155 #include <linux/skbuff.h>
157 static inline struct nlmsghdr
*nlmsg_hdr(const struct sk_buff
*skb
)
159 return (struct nlmsghdr
*)skb
->data
;
162 struct netlink_skb_parms
164 struct ucred creds
; /* Skb credentials */
167 kernel_cap_t eff_cap
;
168 __u32 loginuid
; /* Login (audit) uid */
169 __u32 sessionid
; /* Session id (audit) */
170 __u32 sid
; /* SELinux security id */
173 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
174 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
177 extern struct sock
*netlink_kernel_create(struct net
*net
,
178 int unit
,unsigned int groups
,
179 void (*input
)(struct sk_buff
*skb
),
180 struct mutex
*cb_mutex
,
181 struct module
*module
);
182 extern void netlink_kernel_release(struct sock
*sk
);
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_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
);
186 extern int netlink_has_listeners(struct sock
*sk
, unsigned int group
);
187 extern int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
, int nonblock
);
188 extern int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
,
189 __u32 group
, gfp_t allocation
);
190 extern void netlink_set_err(struct sock
*ssk
, __u32 pid
, __u32 group
, int code
);
191 extern int netlink_register_notifier(struct notifier_block
*nb
);
192 extern int netlink_unregister_notifier(struct notifier_block
*nb
);
194 /* finegrained unicast helpers: */
195 struct sock
*netlink_getsockbyfilp(struct file
*filp
);
196 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
,
197 long *timeo
, struct sock
*ssk
);
198 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
);
199 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
);
202 * skb should fit one page. This choice is good for headerless malloc.
203 * But we should limit to 8K so that userspace does not have to
204 * use enormous buffer sizes on recvmsg() calls just to avoid
205 * MSG_TRUNC when PAGE_SIZE is very large.
207 #if PAGE_SIZE < 8192UL
208 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
210 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
213 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
216 struct netlink_callback
219 struct nlmsghdr
*nlh
;
220 int (*dump
)(struct sk_buff
* skb
, struct netlink_callback
*cb
);
221 int (*done
)(struct netlink_callback
*cb
);
226 struct netlink_notify
233 static __inline__
struct nlmsghdr
*
234 __nlmsg_put(struct sk_buff
*skb
, u32 pid
, u32 seq
, int type
, int len
, int flags
)
236 struct nlmsghdr
*nlh
;
237 int size
= NLMSG_LENGTH(len
);
239 nlh
= (struct nlmsghdr
*)skb_put(skb
, NLMSG_ALIGN(size
));
240 nlh
->nlmsg_type
= type
;
241 nlh
->nlmsg_len
= size
;
242 nlh
->nlmsg_flags
= flags
;
243 nlh
->nlmsg_pid
= pid
;
244 nlh
->nlmsg_seq
= seq
;
245 if (!__builtin_constant_p(size
) || NLMSG_ALIGN(size
) - size
!= 0)
246 memset(NLMSG_DATA(nlh
) + len
, 0, NLMSG_ALIGN(size
) - size
);
250 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
251 ({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
252 goto nlmsg_failure; \
253 __nlmsg_put(skb, pid, seq, type, len, flags); })
255 #define NLMSG_PUT(skb, pid, seq, type, len) \
256 NLMSG_NEW(skb, pid, seq, type, len, 0)
258 extern int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
259 struct nlmsghdr
*nlh
,
260 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*),
261 int (*done
)(struct netlink_callback
*));
264 #define NL_NONROOT_RECV 0x1
265 #define NL_NONROOT_SEND 0x2
266 extern void netlink_set_nonroot(int protocol
, unsigned flag
);
268 #endif /* __KERNEL__ */
270 #endif /* __LINUX_NETLINK_H */
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