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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/netlink.h
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 */
31 sa_family_t nl_family
; /* AF_NETLINK */
32 unsigned short nl_pad
; /* zero */
33 __u32 nl_pid
; /* process pid */
34 __u32 nl_groups
; /* multicast groups mask */
39 __u32 nlmsg_len
; /* Length of message including header */
40 __u16 nlmsg_type
; /* Message content */
41 __u16 nlmsg_flags
; /* Additional flags */
42 __u32 nlmsg_seq
; /* Sequence number */
43 __u32 nlmsg_pid
; /* Sending process PID */
48 #define NLM_F_REQUEST 1 /* It is request message. */
49 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
50 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
51 #define NLM_F_ECHO 8 /* Echo this request */
53 /* Modifiers to GET request */
54 #define NLM_F_ROOT 0x100 /* specify tree root */
55 #define NLM_F_MATCH 0x200 /* return all matching */
56 #define NLM_F_ATOMIC 0x400 /* atomic GET */
57 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
59 /* Modifiers to NEW request */
60 #define NLM_F_REPLACE 0x100 /* Override existing */
61 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
62 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
63 #define NLM_F_APPEND 0x800 /* Add to end of list */
66 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
67 4.4BSD CHANGE NLM_F_REPLACE
69 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
74 #define NLMSG_ALIGNTO 4
75 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
76 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
77 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
78 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
79 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
80 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
81 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
82 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
83 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
84 (nlh)->nlmsg_len <= (len))
85 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
87 #define NLMSG_NOOP 0x1 /* Nothing. */
88 #define NLMSG_ERROR 0x2 /* Error */
89 #define NLMSG_DONE 0x3 /* End of a dump */
90 #define NLMSG_OVERRUN 0x4 /* Data lost */
92 #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
109 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
112 NETLINK_UNCONNECTED
= 0,
117 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
118 * +---------------------+- - -+- - - - - - - - - -+- - -+
119 * | Header | Pad | Payload | Pad |
120 * | (struct nlattr) | ing | | ing |
121 * +---------------------+- - -+- - - - - - - - - -+- - -+
122 * <-------------- nlattr->nla_len -------------->
131 #define NLA_ALIGNTO 4
132 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
133 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
137 #include <linux/capability.h>
138 #include <linux/skbuff.h>
140 struct netlink_skb_parms
142 struct ucred creds
; /* Skb credentials */
146 kernel_cap_t eff_cap
;
147 __u32 loginuid
; /* Login (audit) uid */
148 __u32 sid
; /* SELinux security id */
151 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
152 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
155 extern struct sock
*netlink_kernel_create(int unit
, unsigned int groups
, void (*input
)(struct sock
*sk
, int len
), struct module
*module
);
156 extern void netlink_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
);
157 extern int netlink_has_listeners(struct sock
*sk
, unsigned int group
);
158 extern int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
, int nonblock
);
159 extern int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, __u32 pid
,
160 __u32 group
, gfp_t allocation
);
161 extern void netlink_set_err(struct sock
*ssk
, __u32 pid
, __u32 group
, int code
);
162 extern int netlink_register_notifier(struct notifier_block
*nb
);
163 extern int netlink_unregister_notifier(struct notifier_block
*nb
);
165 /* finegrained unicast helpers: */
166 struct sock
*netlink_getsockbyfilp(struct file
*filp
);
167 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
, int nonblock
,
168 long timeo
, struct sock
*ssk
);
169 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
);
170 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
, int protocol
);
173 * skb should fit one page. This choice is good for headerless malloc.
175 #define NLMSG_GOODORDER 0
176 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
179 struct netlink_callback
182 struct nlmsghdr
*nlh
;
183 int (*dump
)(struct sk_buff
* skb
, struct netlink_callback
*cb
);
184 int (*done
)(struct netlink_callback
*cb
);
189 struct netlink_notify
195 static __inline__
struct nlmsghdr
*
196 __nlmsg_put(struct sk_buff
*skb
, u32 pid
, u32 seq
, int type
, int len
, int flags
)
198 struct nlmsghdr
*nlh
;
199 int size
= NLMSG_LENGTH(len
);
201 nlh
= (struct nlmsghdr
*)skb_put(skb
, NLMSG_ALIGN(size
));
202 nlh
->nlmsg_type
= type
;
203 nlh
->nlmsg_len
= size
;
204 nlh
->nlmsg_flags
= flags
;
205 nlh
->nlmsg_pid
= pid
;
206 nlh
->nlmsg_seq
= seq
;
207 memset(NLMSG_DATA(nlh
) + len
, 0, NLMSG_ALIGN(size
) - size
);
211 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
212 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
213 goto nlmsg_failure; \
214 __nlmsg_put(skb, pid, seq, type, len, flags); })
216 #define NLMSG_PUT(skb, pid, seq, type, len) \
217 NLMSG_NEW(skb, pid, seq, type, len, 0)
219 #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
220 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
221 (cb)->nlh->nlmsg_seq, type, len, flags)
223 #define NLMSG_END(skb, nlh) \
224 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
227 #define NLMSG_CANCEL(skb, nlh) \
228 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
231 extern int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
232 struct nlmsghdr
*nlh
,
233 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*),
234 int (*done
)(struct netlink_callback
*));
237 #define NL_NONROOT_RECV 0x1
238 #define NL_NONROOT_SEND 0x2
239 extern void netlink_set_nonroot(int protocol
, unsigned flag
);
241 #endif /* __KERNEL__ */
243 #endif /* __LINUX_NETLINK_H */