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_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_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
25#define MAX_LINKS 32
26
27struct sockaddr_nl
28{
29 sa_family_t nl_family; /* AF_NETLINK */
30 unsigned short nl_pad; /* zero */
31 __u32 nl_pid; /* process pid */
32 __u32 nl_groups; /* multicast groups mask */
33};
34
35struct nlmsghdr
36{
37 __u32 nlmsg_len; /* Length of message including header */
38 __u16 nlmsg_type; /* Message content */
39 __u16 nlmsg_flags; /* Additional flags */
40 __u32 nlmsg_seq; /* Sequence number */
41 __u32 nlmsg_pid; /* Sending process PID */
42};
43
44/* Flags values */
45
46#define NLM_F_REQUEST 1 /* It is request message. */
47#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
48#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
49#define NLM_F_ECHO 8 /* Echo this request */
50
51/* Modifiers to GET request */
52#define NLM_F_ROOT 0x100 /* specify tree root */
53#define NLM_F_MATCH 0x200 /* return all matching */
54#define NLM_F_ATOMIC 0x400 /* atomic GET */
55#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
56
57/* Modifiers to NEW request */
58#define NLM_F_REPLACE 0x100 /* Override existing */
59#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
60#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
61#define NLM_F_APPEND 0x800 /* Add to end of list */
62
63/*
64 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
65 4.4BSD CHANGE NLM_F_REPLACE
66
67 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
68 Append NLM_F_CREATE
69 Check NLM_F_EXCL
70 */
71
72#define NLMSG_ALIGNTO 4
73#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
74#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
75#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
76#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
77#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
78#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
79 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
80#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
81 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
82 (nlh)->nlmsg_len <= (len))
83#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
84
85#define NLMSG_NOOP 0x1 /* Nothing. */
86#define NLMSG_ERROR 0x2 /* Error */
87#define NLMSG_DONE 0x3 /* End of a dump */
88#define NLMSG_OVERRUN 0x4 /* Data lost */
89
90#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
91
92struct nlmsgerr
93{
94 int error;
95 struct nlmsghdr msg;
96};
97
98#define NETLINK_ADD_MEMBERSHIP 1
99#define NETLINK_DROP_MEMBERSHIP 2
100#define NETLINK_PKTINFO 3
101
102struct nl_pktinfo
103{
104 __u32 group;
105};
106
107#define NET_MAJOR 36 /* Major 36 is reserved for networking */
108
109enum {
110 NETLINK_UNCONNECTED = 0,
111 NETLINK_CONNECTED,
112};
113
114/*
115 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
116 * +---------------------+- - -+- - - - - - - - - -+- - -+
117 * | Header | Pad | Payload | Pad |
118 * | (struct nlattr) | ing | | ing |
119 * +---------------------+- - -+- - - - - - - - - -+- - -+
120 * <-------------- nlattr->nla_len -------------->
121 */
122
123struct nlattr
124{
125 __u16 nla_len;
126 __u16 nla_type;
127};
128
129#define NLA_ALIGNTO 4
130#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
131#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
132
133#ifdef __KERNEL__
134
135#include <linux/capability.h>
136#include <linux/skbuff.h>
137
138struct netlink_skb_parms
139{
140 struct ucred creds; /* Skb credentials */
141 __u32 pid;
142 __u32 dst_pid;
143 __u32 dst_group;
144 kernel_cap_t eff_cap;
145 __u32 loginuid; /* Login (audit) uid */
146};
147
148#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
149#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
150
151
152extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
153extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
154extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
155extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
156 __u32 group, gfp_t allocation);
157extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
158extern int netlink_register_notifier(struct notifier_block *nb);
159extern int netlink_unregister_notifier(struct notifier_block *nb);
160
161/* finegrained unicast helpers: */
162struct sock *netlink_getsockbyfilp(struct file *filp);
163int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo);
164void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
165int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
166
167/*
168 * skb should fit one page. This choice is good for headerless malloc.
169 */
170#define NLMSG_GOODORDER 0
171#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
172
173
174struct netlink_callback
175{
176 struct sk_buff *skb;
177 struct nlmsghdr *nlh;
178 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
179 int (*done)(struct netlink_callback *cb);
180 int family;
181 long args[5];
182};
183
184struct netlink_notify
185{
186 int pid;
187 int protocol;
188};
189
190static __inline__ struct nlmsghdr *
191__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
192{
193 struct nlmsghdr *nlh;
194 int size = NLMSG_LENGTH(len);
195
196 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
197 nlh->nlmsg_type = type;
198 nlh->nlmsg_len = size;
199 nlh->nlmsg_flags = flags;
200 nlh->nlmsg_pid = pid;
201 nlh->nlmsg_seq = seq;
202 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
203 return nlh;
204}
205
206#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
207({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
208 goto nlmsg_failure; \
209 __nlmsg_put(skb, pid, seq, type, len, flags); })
210
211#define NLMSG_PUT(skb, pid, seq, type, len) \
212 NLMSG_NEW(skb, pid, seq, type, len, 0)
213
214#define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
215 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
216 (cb)->nlh->nlmsg_seq, type, len, flags)
217
218#define NLMSG_END(skb, nlh) \
219({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
220 (skb)->len; })
221
222#define NLMSG_CANCEL(skb, nlh) \
223({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
224 -1; })
225
226extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
227 struct nlmsghdr *nlh,
228 int (*dump)(struct sk_buff *skb, struct netlink_callback*),
229 int (*done)(struct netlink_callback*));
230
231
232#define NL_NONROOT_RECV 0x1
233#define NL_NONROOT_SEND 0x2
234extern void netlink_set_nonroot(int protocol, unsigned flag);
235
236#endif /* __KERNEL__ */
237
238#endif /* __LINUX_NETLINK_H */