Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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_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
27#define MAX_LINKS 32
28
29struct sockaddr_nl
30{
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 */
35};
36
37struct nlmsghdr
38{
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 */
44};
45
46/* Flags values */
47
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 */
52
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)
58
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 */
64
65/*
66 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
67 4.4BSD CHANGE NLM_F_REPLACE
68
69 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
70 Append NLM_F_CREATE
71 Check NLM_F_EXCL
72 */
73
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)))
86
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 */
91
92#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
93
94struct nlmsgerr
95{
96 int error;
97 struct nlmsghdr msg;
98};
99
100#define NETLINK_ADD_MEMBERSHIP 1
101#define NETLINK_DROP_MEMBERSHIP 2
102#define NETLINK_PKTINFO 3
103
104struct nl_pktinfo
105{
106 __u32 group;
107};
108
109#define NET_MAJOR 36 /* Major 36 is reserved for networking */
110
111enum {
112 NETLINK_UNCONNECTED = 0,
113 NETLINK_CONNECTED,
114};
115
116/*
117 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
118 * +---------------------+- - -+- - - - - - - - - -+- - -+
119 * | Header | Pad | Payload | Pad |
120 * | (struct nlattr) | ing | | ing |
121 * +---------------------+- - -+- - - - - - - - - -+- - -+
122 * <-------------- nlattr->nla_len -------------->
123 */
124
125struct nlattr
126{
127 __u16 nla_len;
128 __u16 nla_type;
129};
130
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)))
134
135#ifdef __KERNEL__
136
137#include <linux/capability.h>
138#include <linux/skbuff.h>
139
140struct netlink_skb_parms
141{
142 struct ucred creds; /* Skb credentials */
143 __u32 pid;
144 __u32 dst_group;
145 kernel_cap_t eff_cap;
146 __u32 loginuid; /* Login (audit) uid */
147 __u32 sid; /* SELinux security id */
148};
149
150#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
151#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
152
153
154extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
155extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
156extern int netlink_has_listeners(struct sock *sk, unsigned int group);
157extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
158extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
159 __u32 group, gfp_t allocation);
160extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
161extern int netlink_register_notifier(struct notifier_block *nb);
162extern int netlink_unregister_notifier(struct notifier_block *nb);
163
164/* finegrained unicast helpers: */
165struct sock *netlink_getsockbyfilp(struct file *filp);
166int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
167 long timeo, struct sock *ssk);
168void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
169int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
170
171/*
172 * skb should fit one page. This choice is good for headerless malloc.
173 */
174#define NLMSG_GOODORDER 0
175#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
176#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
177
178
179struct netlink_callback
180{
181 struct sk_buff *skb;
182 struct nlmsghdr *nlh;
183 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
184 int (*done)(struct netlink_callback *cb);
185 int family;
186 long args[5];
187};
188
189struct netlink_notify
190{
191 int pid;
192 int protocol;
193};
194
195static __inline__ struct nlmsghdr *
196__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
197{
198 struct nlmsghdr *nlh;
199 int size = NLMSG_LENGTH(len);
200
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);
208 return nlh;
209}
210
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); })
215
216#define NLMSG_PUT(skb, pid, seq, type, len) \
217 NLMSG_NEW(skb, pid, seq, type, len, 0)
218
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)
222
223#define NLMSG_END(skb, nlh) \
224({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
225 (skb)->len; })
226
227#define NLMSG_CANCEL(skb, nlh) \
228({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
229 -1; })
230
231extern 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*));
235
236
237#define NL_NONROOT_RECV 0x1
238#define NL_NONROOT_SEND 0x2
239extern void netlink_set_nonroot(int protocol, unsigned flag);
240
241#endif /* __KERNEL__ */
242
243#endif /* __LINUX_NETLINK_H */