Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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_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 */
23
24#define MAX_LINKS 32
25
26struct sockaddr_nl
27{
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 */
32};
33
34struct nlmsghdr
35{
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 */
41};
42
43/* Flags values */
44
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 */
49
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)
55
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 */
61
62/*
63 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
64 4.4BSD CHANGE NLM_F_REPLACE
65
66 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
67 Append NLM_F_CREATE
68 Check NLM_F_EXCL
69 */
70
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)))
82
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 */
87
88struct nlmsgerr
89{
90 int error;
91 struct nlmsghdr msg;
92};
93
94#define NET_MAJOR 36 /* Major 36 is reserved for networking */
95
96enum {
97 NETLINK_UNCONNECTED = 0,
98 NETLINK_CONNECTED,
99};
100
101#ifdef __KERNEL__
102
103#include <linux/capability.h>
104#include <linux/skbuff.h>
105
106struct netlink_skb_parms
107{
108 struct ucred creds; /* Skb credentials */
109 __u32 pid;
110 __u32 groups;
111 __u32 dst_pid;
112 __u32 dst_groups;
113 kernel_cap_t eff_cap;
114 __u32 loginuid; /* Login (audit) uid */
115};
116
117#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
118#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
119
120
121extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len));
122extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
123extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
124extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
125 __u32 group, int allocation);
126extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
127extern int netlink_register_notifier(struct notifier_block *nb);
128extern int netlink_unregister_notifier(struct notifier_block *nb);
129
130/* finegrained unicast helpers: */
131struct sock *netlink_getsockbyfilp(struct file *filp);
132int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo);
133void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
134int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
135
136/*
137 * skb should fit one page. This choice is good for headerless malloc.
138 */
139#define NLMSG_GOODORDER 0
140#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
141
142
143struct netlink_callback
144{
145 struct sk_buff *skb;
146 struct nlmsghdr *nlh;
147 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
148 int (*done)(struct netlink_callback *cb);
149 int family;
150 long args[5];
151};
152
153struct netlink_notify
154{
155 int pid;
156 int protocol;
157};
158
159static __inline__ struct nlmsghdr *
160__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
161{
162 struct nlmsghdr *nlh;
163 int size = NLMSG_LENGTH(len);
164
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 return nlh;
172}
173
174#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
175({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
176 goto nlmsg_failure; \
177 __nlmsg_put(skb, pid, seq, type, len, flags); })
178
179#define NLMSG_PUT(skb, pid, seq, type, len) \
180 NLMSG_NEW(skb, pid, seq, type, len, 0)
181
182#define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
183 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
184 (cb)->nlh->nlmsg_seq, type, len, flags)
185
186#define NLMSG_END(skb, nlh) \
187({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
188 (skb)->len; })
189
190#define NLMSG_CANCEL(skb, nlh) \
191({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
192 -1; })
193
194extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
195 struct nlmsghdr *nlh,
196 int (*dump)(struct sk_buff *skb, struct netlink_callback*),
197 int (*done)(struct netlink_callback*));
198
199
200#define NL_NONROOT_RECV 0x1
201#define NL_NONROOT_SEND 0x2
202extern void netlink_set_nonroot(int protocol, unsigned flag);
203
204#endif /* __KERNEL__ */
205
206#endif /* __LINUX_NETLINK_H */