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 sa_family_t nl_family; /* AF_NETLINK */
34 unsigned short nl_pad; /* zero */
35 __u32 nl_pid; /* port ID */
36 __u32 nl_groups; /* multicast groups mask */
37};
38
39struct nlmsghdr {
40 __u32 nlmsg_len; /* Length of message including header */
41 __u16 nlmsg_type; /* Message content */
42 __u16 nlmsg_flags; /* Additional flags */
43 __u32 nlmsg_seq; /* Sequence number */
44 __u32 nlmsg_pid; /* Sending process port ID */
45};
46
47/* Flags values */
48
49#define NLM_F_REQUEST 1 /* It is request message. */
50#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
51#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
52#define NLM_F_ECHO 8 /* Echo this request */
53
54/* Modifiers to GET request */
55#define NLM_F_ROOT 0x100 /* specify tree root */
56#define NLM_F_MATCH 0x200 /* return all matching */
57#define NLM_F_ATOMIC 0x400 /* atomic GET */
58#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
59
60/* Modifiers to NEW request */
61#define NLM_F_REPLACE 0x100 /* Override existing */
62#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
63#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
64#define NLM_F_APPEND 0x800 /* Add to end of list */
65
66/*
67 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
68 4.4BSD CHANGE NLM_F_REPLACE
69
70 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
71 Append NLM_F_CREATE
72 Check NLM_F_EXCL
73 */
74
75#define NLMSG_ALIGNTO 4
76#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
77#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
78#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
79#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
80#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
81#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
82 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
83#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
84 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
85 (nlh)->nlmsg_len <= (len))
86#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
87
88#define NLMSG_NOOP 0x1 /* Nothing. */
89#define NLMSG_ERROR 0x2 /* Error */
90#define NLMSG_DONE 0x3 /* End of a dump */
91#define NLMSG_OVERRUN 0x4 /* Data lost */
92
93#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
94
95struct nlmsgerr {
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#define NETLINK_BROADCAST_ERROR 4
104#define NETLINK_NO_ENOBUFS 5
105
106struct nl_pktinfo {
107 __u32 group;
108};
109
110#define NET_MAJOR 36 /* Major 36 is reserved for networking */
111
112enum {
113 NETLINK_UNCONNECTED = 0,
114 NETLINK_CONNECTED,
115};
116
117/*
118 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
119 * +---------------------+- - -+- - - - - - - - - -+- - -+
120 * | Header | Pad | Payload | Pad |
121 * | (struct nlattr) | ing | | ing |
122 * +---------------------+- - -+- - - - - - - - - -+- - -+
123 * <-------------- nlattr->nla_len -------------->
124 */
125
126struct nlattr {
127 __u16 nla_len;
128 __u16 nla_type;
129};
130
131/*
132 * nla_type (16 bits)
133 * +---+---+-------------------------------+
134 * | N | O | Attribute Type |
135 * +---+---+-------------------------------+
136 * N := Carries nested attributes
137 * O := Payload stored in network byte order
138 *
139 * Note: The N and O flag are mutually exclusive.
140 */
141#define NLA_F_NESTED (1 << 15)
142#define NLA_F_NET_BYTEORDER (1 << 14)
143#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
144
145#define NLA_ALIGNTO 4
146#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
147#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
148
149#ifdef __KERNEL__
150
151#include <linux/capability.h>
152#include <linux/skbuff.h>
153
154static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
155{
156 return (struct nlmsghdr *)skb->data;
157}
158
159struct netlink_skb_parms {
160 struct ucred creds; /* Skb credentials */
161 __u32 pid;
162 __u32 dst_group;
163 kernel_cap_t eff_cap;
164 __u32 loginuid; /* Login (audit) uid */
165 __u32 sessionid; /* Session id (audit) */
166 __u32 sid; /* SELinux security id */
167};
168
169#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
170#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
171
172
173extern void netlink_table_grab(void);
174extern void netlink_table_ungrab(void);
175
176extern struct sock *netlink_kernel_create(struct net *net,
177 int unit,unsigned int groups,
178 void (*input)(struct sk_buff *skb),
179 struct mutex *cb_mutex,
180 struct module *module);
181extern void netlink_kernel_release(struct sock *sk);
182extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
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_clear_multicast_users(struct sock *sk, unsigned int group);
186extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
187extern int netlink_has_listeners(struct sock *sk, unsigned int group);
188extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
189extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
190 __u32 group, gfp_t allocation);
191extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
192extern int netlink_register_notifier(struct notifier_block *nb);
193extern int netlink_unregister_notifier(struct notifier_block *nb);
194
195/* finegrained unicast helpers: */
196struct sock *netlink_getsockbyfilp(struct file *filp);
197int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
198 long *timeo, struct sock *ssk);
199void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
200int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
201
202/*
203 * skb should fit one page. This choice is good for headerless malloc.
204 * But we should limit to 8K so that userspace does not have to
205 * use enormous buffer sizes on recvmsg() calls just to avoid
206 * MSG_TRUNC when PAGE_SIZE is very large.
207 */
208#if PAGE_SIZE < 8192UL
209#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
210#else
211#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
212#endif
213
214#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
215
216
217struct netlink_callback {
218 struct sk_buff *skb;
219 const struct nlmsghdr *nlh;
220 int (*dump)(struct sk_buff * skb,
221 struct netlink_callback *cb);
222 int (*done)(struct netlink_callback *cb);
223 int family;
224 long args[6];
225};
226
227struct netlink_notify {
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 if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)
246 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
247 return nlh;
248}
249
250#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
251({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
252 goto nlmsg_failure; \
253 __nlmsg_put(skb, pid, seq, type, len, flags); })
254
255#define NLMSG_PUT(skb, pid, seq, type, len) \
256 NLMSG_NEW(skb, pid, seq, type, len, 0)
257
258extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
259 const struct nlmsghdr *nlh,
260 int (*dump)(struct sk_buff *skb, struct netlink_callback*),
261 int (*done)(struct netlink_callback*));
262
263
264#define NL_NONROOT_RECV 0x1
265#define NL_NONROOT_SEND 0x2
266extern void netlink_set_nonroot(int protocol, unsigned flag);
267
268#endif /* __KERNEL__ */
269
270#endif /* __LINUX_NETLINK_H */