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_W1 1 /* 1-wire subsystem */
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_ISCSI 8 /* Open-iSCSI */
16#define NETLINK_AUDIT 9 /* auditing */
17#define NETLINK_FIB_LOOKUP 10
18#define NETLINK_NETFILTER 12 /* netfilter subsystem */
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
23#define MAX_LINKS 32
24
25struct sockaddr_nl
26{
27 sa_family_t nl_family; /* AF_NETLINK */
28 unsigned short nl_pad; /* zero */
29 __u32 nl_pid; /* process pid */
30 __u32 nl_groups; /* multicast groups mask */
31};
32
33struct nlmsghdr
34{
35 __u32 nlmsg_len; /* Length of message including header */
36 __u16 nlmsg_type; /* Message content */
37 __u16 nlmsg_flags; /* Additional flags */
38 __u32 nlmsg_seq; /* Sequence number */
39 __u32 nlmsg_pid; /* Sending process PID */
40};
41
42/* Flags values */
43
44#define NLM_F_REQUEST 1 /* It is request message. */
45#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
46#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
47#define NLM_F_ECHO 8 /* Echo this request */
48
49/* Modifiers to GET request */
50#define NLM_F_ROOT 0x100 /* specify tree root */
51#define NLM_F_MATCH 0x200 /* return all matching */
52#define NLM_F_ATOMIC 0x400 /* atomic GET */
53#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
54
55/* Modifiers to NEW request */
56#define NLM_F_REPLACE 0x100 /* Override existing */
57#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
58#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
59#define NLM_F_APPEND 0x800 /* Add to end of list */
60
61/*
62 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
63 4.4BSD CHANGE NLM_F_REPLACE
64
65 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
66 Append NLM_F_CREATE
67 Check NLM_F_EXCL
68 */
69
70#define NLMSG_ALIGNTO 4
71#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
72#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
73#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
74#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
75#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
76 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
77#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
78 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
79 (nlh)->nlmsg_len <= (len))
80#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
81
82#define NLMSG_NOOP 0x1 /* Nothing. */
83#define NLMSG_ERROR 0x2 /* Error */
84#define NLMSG_DONE 0x3 /* End of a dump */
85#define NLMSG_OVERRUN 0x4 /* Data lost */
86
87struct nlmsgerr
88{
89 int error;
90 struct nlmsghdr msg;
91};
92
93#define NET_MAJOR 36 /* Major 36 is reserved for networking */
94
95enum {
96 NETLINK_UNCONNECTED = 0,
97 NETLINK_CONNECTED,
98};
99
100#ifdef __KERNEL__
101
102#include <linux/capability.h>
103#include <linux/skbuff.h>
104
105struct netlink_skb_parms
106{
107 struct ucred creds; /* Skb credentials */
108 __u32 pid;
109 __u32 groups;
110 __u32 dst_pid;
111 __u32 dst_groups;
112 kernel_cap_t eff_cap;
113 __u32 loginuid; /* Login (audit) uid */
114};
115
116#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
117#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
118
119
120extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len));
121extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
122extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
123extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
124 __u32 group, int allocation);
125extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
126extern int netlink_register_notifier(struct notifier_block *nb);
127extern int netlink_unregister_notifier(struct notifier_block *nb);
128
129/* finegrained unicast helpers: */
130struct sock *netlink_getsockbyfilp(struct file *filp);
131int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo);
132void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
133int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
134
135/*
136 * skb should fit one page. This choice is good for headerless malloc.
137 */
138#define NLMSG_GOODORDER 0
139#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
140
141
142struct netlink_callback
143{
144 struct sk_buff *skb;
145 struct nlmsghdr *nlh;
146 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
147 int (*done)(struct netlink_callback *cb);
148 int family;
149 long args[5];
150};
151
152struct netlink_notify
153{
154 int pid;
155 int protocol;
156};
157
158static __inline__ struct nlmsghdr *
159__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
160{
161 struct nlmsghdr *nlh;
162 int size = NLMSG_LENGTH(len);
163
164 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
165 nlh->nlmsg_type = type;
166 nlh->nlmsg_len = size;
167 nlh->nlmsg_flags = flags;
168 nlh->nlmsg_pid = pid;
169 nlh->nlmsg_seq = seq;
170 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
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 */