Line data Source code
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 :
30 : struct net;
31 :
32 : struct 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 :
39 : struct 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 :
95 : struct 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 :
106 : struct nl_pktinfo {
107 : __u32 group;
108 : };
109 :
110 : #define NET_MAJOR 36 /* Major 36 is reserved for networking */
111 :
112 : enum {
113 : NETLINK_UNCONNECTED = 0,
114 1 : 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 :
126 : struct 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 :
154 : static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
155 : {
156 : return (struct nlmsghdr *)skb->data;
157 : }
158 :
159 : struct 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 :
173 : extern void netlink_table_grab(void);
174 : extern void netlink_table_ungrab(void);
175 :
176 : extern 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);
181 : extern void netlink_kernel_release(struct sock *sk);
182 : extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
183 : extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
184 : extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
185 : extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
186 : extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
187 : extern int netlink_has_listeners(struct sock *sk, unsigned int group);
188 : extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
189 : extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
190 : __u32 group, gfp_t allocation);
191 : extern int netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
192 : extern int netlink_register_notifier(struct notifier_block *nb);
193 : extern int netlink_unregister_notifier(struct notifier_block *nb);
194 :
195 : /* finegrained unicast helpers: */
196 : struct sock *netlink_getsockbyfilp(struct file *filp);
197 : int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
198 : long *timeo, struct sock *ssk);
199 : void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
200 : int 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 :
217 : struct 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 :
227 : struct netlink_notify {
228 : struct net *net;
229 : int pid;
230 : int protocol;
231 : };
232 :
233 : static __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 :
258 : extern 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
266 : extern void netlink_set_nonroot(int protocol, unsigned flag);
267 :
268 : #endif /* __KERNEL__ */
269 :
270 : #endif /* __LINUX_NETLINK_H */
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