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#define NETLINK_ECRYPTFS 19
27
28#define MAX_LINKS 32
29
30struct net;
31
32struct sockaddr_nl
33{
34 sa_family_t nl_family; /* AF_NETLINK */
35 unsigned short nl_pad; /* zero */
36 __u32 nl_pid; /* port ID */
37 __u32 nl_groups; /* multicast groups mask */
38};
39
40struct nlmsghdr
41{
42 __u32 nlmsg_len; /* Length of message including header */
43 __u16 nlmsg_type; /* Message content */
44 __u16 nlmsg_flags; /* Additional flags */
45 __u32 nlmsg_seq; /* Sequence number */
46 __u32 nlmsg_pid; /* Sending process port ID */
47};
48
49/* Flags values */
50
51#define NLM_F_REQUEST 1 /* It is request message. */
52#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
53#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
54#define NLM_F_ECHO 8 /* Echo this request */
55
56/* Modifiers to GET request */
57#define NLM_F_ROOT 0x100 /* specify tree root */
58#define NLM_F_MATCH 0x200 /* return all matching */
59#define NLM_F_ATOMIC 0x400 /* atomic GET */
60#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
61
62/* Modifiers to NEW request */
63#define NLM_F_REPLACE 0x100 /* Override existing */
64#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
65#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
66#define NLM_F_APPEND 0x800 /* Add to end of list */
67
68/*
69 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
70 4.4BSD CHANGE NLM_F_REPLACE
71
72 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
73 Append NLM_F_CREATE
74 Check NLM_F_EXCL
75 */
76
77#define NLMSG_ALIGNTO 4
78#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
79#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
80#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
81#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
82#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
83#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
84 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
85#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
86 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
87 (nlh)->nlmsg_len <= (len))
88#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
89
90#define NLMSG_NOOP 0x1 /* Nothing. */
91#define NLMSG_ERROR 0x2 /* Error */
92#define NLMSG_DONE 0x3 /* End of a dump */
93#define NLMSG_OVERRUN 0x4 /* Data lost */
94
95#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
96
97struct nlmsgerr
98{
99 int error;
100 struct nlmsghdr msg;
101};
102
103#define NETLINK_ADD_MEMBERSHIP 1
104#define NETLINK_DROP_MEMBERSHIP 2
105#define NETLINK_PKTINFO 3
106
107struct nl_pktinfo
108{
109 __u32 group;
110};
111
112#define NET_MAJOR 36 /* Major 36 is reserved for networking */
113
114enum {
115 NETLINK_UNCONNECTED = 0,
116 NETLINK_CONNECTED,
117};
118
119/*
120 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
121 * +---------------------+- - -+- - - - - - - - - -+- - -+
122 * | Header | Pad | Payload | Pad |
123 * | (struct nlattr) | ing | | ing |
124 * +---------------------+- - -+- - - - - - - - - -+- - -+
125 * <-------------- nlattr->nla_len -------------->
126 */
127
128struct nlattr
129{
130 __u16 nla_len;
131 __u16 nla_type;
132};
133
134/*
135 * nla_type (16 bits)
136 * +---+---+-------------------------------+
137 * | N | O | Attribute Type |
138 * +---+---+-------------------------------+
139 * N := Carries nested attributes
140 * O := Payload stored in network byte order
141 *
142 * Note: The N and O flag are mutually exclusive.
143 */
144#define NLA_F_NESTED (1 << 15)
145#define NLA_F_NET_BYTEORDER (1 << 14)
146#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
147
148#define NLA_ALIGNTO 4
149#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
150#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
151
152#ifdef __KERNEL__
153
154#include <linux/capability.h>
155#include <linux/skbuff.h>
156
157static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
158{
159 return (struct nlmsghdr *)skb->data;
160}
161
162struct netlink_skb_parms
163{
164 struct ucred creds; /* Skb credentials */
165 __u32 pid;
166 __u32 dst_group;
167 kernel_cap_t eff_cap;
168 __u32 loginuid; /* Login (audit) uid */
169 __u32 sessionid; /* Session id (audit) */
170 __u32 sid; /* SELinux security id */
171};
172
173#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
174#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
175
176
177extern struct sock *netlink_kernel_create(struct net *net,
178 int unit,unsigned int groups,
179 void (*input)(struct sk_buff *skb),
180 struct mutex *cb_mutex,
181 struct module *module);
182extern void netlink_kernel_release(struct sock *sk);
183extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
184extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
185extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
186extern int netlink_has_listeners(struct sock *sk, unsigned int group);
187extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
188extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
189 __u32 group, gfp_t allocation);
190extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
191extern int netlink_register_notifier(struct notifier_block *nb);
192extern int netlink_unregister_notifier(struct notifier_block *nb);
193
194/* finegrained unicast helpers: */
195struct sock *netlink_getsockbyfilp(struct file *filp);
196int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
197 long *timeo, struct sock *ssk);
198void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
199int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
200
201/*
202 * skb should fit one page. This choice is good for headerless malloc.
203 * But we should limit to 8K so that userspace does not have to
204 * use enormous buffer sizes on recvmsg() calls just to avoid
205 * MSG_TRUNC when PAGE_SIZE is very large.
206 */
207#if PAGE_SIZE < 8192UL
208#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
209#else
210#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
211#endif
212
213#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
214
215
216struct netlink_callback
217{
218 struct sk_buff *skb;
219 struct nlmsghdr *nlh;
220 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
221 int (*done)(struct netlink_callback *cb);
222 int family;
223 long args[6];
224};
225
226struct netlink_notify
227{
228 struct net *net;
229 int pid;
230 int protocol;
231};
232
233static __inline__ struct nlmsghdr *
234__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
235{
236 struct nlmsghdr *nlh;
237 int size = NLMSG_LENGTH(len);
238
239 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
240 nlh->nlmsg_type = type;
241 nlh->nlmsg_len = size;
242 nlh->nlmsg_flags = flags;
243 nlh->nlmsg_pid = pid;
244 nlh->nlmsg_seq = seq;
245 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
246 return nlh;
247}
248
249#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
250({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
251 goto nlmsg_failure; \
252 __nlmsg_put(skb, pid, seq, type, len, flags); })
253
254#define NLMSG_PUT(skb, pid, seq, type, len) \
255 NLMSG_NEW(skb, pid, seq, type, len, 0)
256
257extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
258 struct nlmsghdr *nlh,
259 int (*dump)(struct sk_buff *skb, struct netlink_callback*),
260 int (*done)(struct netlink_callback*));
261
262
263#define NL_NONROOT_RECV 0x1
264#define NL_NONROOT_SEND 0x2
265extern void netlink_set_nonroot(int protocol, unsigned flag);
266
267#endif /* __KERNEL__ */
268
269#endif /* __LINUX_NETLINK_H */