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_SKIP 1 /* Reserved for ENskip */
9 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
10 #define NETLINK_FIREWALL 3 /* Firewalling hook */
11 #define NETLINK_TCPDIAG 4 /* TCP 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_ARPD 8
16 #define NETLINK_AUDIT 9 /* auditing */
17 #define NETLINK_FIB_LOOKUP 10
18 #define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */
19 #define NETLINK_IP6_FW 13
20 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */
21 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
22 #define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */
28 sa_family_t nl_family
; /* AF_NETLINK */
29 unsigned short nl_pad
; /* zero */
30 __u32 nl_pid
; /* process pid */
31 __u32 nl_groups
; /* multicast groups mask */
36 __u32 nlmsg_len
; /* Length of message including header */
37 __u16 nlmsg_type
; /* Message content */
38 __u16 nlmsg_flags
; /* Additional flags */
39 __u32 nlmsg_seq
; /* Sequence number */
40 __u32 nlmsg_pid
; /* Sending process PID */
45 #define NLM_F_REQUEST 1 /* It is request message. */
46 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
47 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
48 #define NLM_F_ECHO 8 /* Echo this request */
50 /* Modifiers to GET request */
51 #define NLM_F_ROOT 0x100 /* specify tree root */
52 #define NLM_F_MATCH 0x200 /* return all matching */
53 #define NLM_F_ATOMIC 0x400 /* atomic GET */
54 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
56 /* Modifiers to NEW request */
57 #define NLM_F_REPLACE 0x100 /* Override existing */
58 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
59 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
60 #define NLM_F_APPEND 0x800 /* Add to end of list */
63 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
64 4.4BSD CHANGE NLM_F_REPLACE
66 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
71 #define NLMSG_ALIGNTO 4
72 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
73 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
74 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
75 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
76 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
77 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
78 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
79 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
80 (nlh)->nlmsg_len <= (len))
81 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
83 #define NLMSG_NOOP 0x1 /* Nothing. */
84 #define NLMSG_ERROR 0x2 /* Error */
85 #define NLMSG_DONE 0x3 /* End of a dump */
86 #define NLMSG_OVERRUN 0x4 /* Data lost */
94 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
97 NETLINK_UNCONNECTED
= 0,
103 #include <linux/capability.h>
104 #include <linux/skbuff.h>
106 struct netlink_skb_parms
108 struct ucred creds
; /* Skb credentials */
113 kernel_cap_t eff_cap
;
114 __u32 loginuid
; /* Login (audit) uid */
117 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
118 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
121 extern struct sock
*netlink_kernel_create(int unit
, void (*input
)(struct sock
*sk
, int len
));
122 extern void netlink_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
);
123 extern int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
, int nonblock
);
124 extern int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
,
125 __u32 group
, int allocation
);
126 extern void netlink_set_err(struct sock
*ssk
, __u32 pid
, __u32 group
, int code
);
127 extern int netlink_register_notifier(struct notifier_block
*nb
);
128 extern int netlink_unregister_notifier(struct notifier_block
*nb
);
130 /* finegrained unicast helpers: */
131 struct sock
*netlink_getsockbyfilp(struct file
*filp
);
132 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
, int nonblock
, long timeo
);
133 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
);
134 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
, int protocol
);
137 * skb should fit one page. This choice is good for headerless malloc.
139 #define NLMSG_GOODORDER 0
140 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
143 struct netlink_callback
146 struct nlmsghdr
*nlh
;
147 int (*dump
)(struct sk_buff
* skb
, struct netlink_callback
*cb
);
148 int (*done
)(struct netlink_callback
*cb
);
153 struct netlink_notify
159 static __inline__
struct nlmsghdr
*
160 __nlmsg_put(struct sk_buff
*skb
, u32 pid
, u32 seq
, int type
, int len
, int flags
)
162 struct nlmsghdr
*nlh
;
163 int size
= NLMSG_LENGTH(len
);
165 nlh
= (struct nlmsghdr
*)skb_put(skb
, NLMSG_ALIGN(size
));
166 nlh
->nlmsg_type
= type
;
167 nlh
->nlmsg_len
= size
;
168 nlh
->nlmsg_flags
= flags
;
169 nlh
->nlmsg_pid
= pid
;
170 nlh
->nlmsg_seq
= seq
;
171 memset(NLMSG_DATA(nlh
) + len
, 0, NLMSG_ALIGN(size
) - size
);
175 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
176 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
177 goto nlmsg_failure; \
178 __nlmsg_put(skb, pid, seq, type, len, flags); })
180 #define NLMSG_PUT(skb, pid, seq, type, len) \
181 NLMSG_NEW(skb, pid, seq, type, len, 0)
183 #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
184 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
185 (cb)->nlh->nlmsg_seq, type, len, flags)
187 #define NLMSG_END(skb, nlh) \
188 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
191 #define NLMSG_CANCEL(skb, nlh) \
192 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
195 extern int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
196 struct nlmsghdr
*nlh
,
197 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*),
198 int (*done
)(struct netlink_callback
*));
201 #define NL_NONROOT_RECV 0x1
202 #define NL_NONROOT_SEND 0x2
203 extern void netlink_set_nonroot(int protocol
, unsigned flag
);
205 #endif /* __KERNEL__ */
207 #endif /* __LINUX_NETLINK_H */