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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 | 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 */ |
271 |
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