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1da177e4 LT |
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 */ | |
bb5427b5 | 8 | #define NETLINK_UNUSED 1 /* Unused number */ |
1da177e4 LT |
9 | #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ |
10 | #define NETLINK_FIREWALL 3 /* Firewalling hook */ | |
73c1f4a0 | 11 | #define NETLINK_INET_DIAG 4 /* INET socket monitoring */ |
1da177e4 LT |
12 | #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ |
13 | #define NETLINK_XFRM 6 /* ipsec */ | |
14 | #define NETLINK_SELINUX 7 /* SELinux event notifications */ | |
4d479e40 | 15 | #define NETLINK_ISCSI 8 /* Open-iSCSI */ |
1da177e4 | 16 | #define NETLINK_AUDIT 9 /* auditing */ |
246955fe | 17 | #define NETLINK_FIB_LOOKUP 10 |
7672d0b5 | 18 | #define NETLINK_CONNECTOR 11 |
63522f7f | 19 | #define NETLINK_NETFILTER 12 /* netfilter subsystem */ |
1da177e4 LT |
20 | #define NETLINK_IP6_FW 13 |
21 | #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ | |
22 | #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ | |
20ae975d | 23 | #define NETLINK_GENERIC 16 |
84314fd4 JS |
24 | /* leave room for NETLINK_DM (DM Events) */ |
25 | #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ | |
88b4a07e | 26 | #define NETLINK_ECRYPTFS 19 |
1da177e4 LT |
27 | |
28 | #define MAX_LINKS 32 | |
29 | ||
30 | struct sockaddr_nl | |
31 | { | |
32 | sa_family_t nl_family; /* AF_NETLINK */ | |
33 | unsigned short nl_pad; /* zero */ | |
34 | __u32 nl_pid; /* process pid */ | |
35 | __u32 nl_groups; /* multicast groups mask */ | |
36 | }; | |
37 | ||
38 | struct nlmsghdr | |
39 | { | |
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 PID */ | |
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) ) | |
bfa83a9e TG |
77 | #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) |
78 | #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) | |
1da177e4 LT |
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 | ||
bfa83a9e TG |
93 | #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ |
94 | ||
1da177e4 LT |
95 | struct nlmsgerr |
96 | { | |
97 | int error; | |
98 | struct nlmsghdr msg; | |
99 | }; | |
100 | ||
9a4595bc PM |
101 | #define NETLINK_ADD_MEMBERSHIP 1 |
102 | #define NETLINK_DROP_MEMBERSHIP 2 | |
103 | #define NETLINK_PKTINFO 3 | |
104 | ||
105 | struct nl_pktinfo | |
106 | { | |
107 | __u32 group; | |
108 | }; | |
109 | ||
1da177e4 LT |
110 | #define NET_MAJOR 36 /* Major 36 is reserved for networking */ |
111 | ||
112 | enum { | |
113 | NETLINK_UNCONNECTED = 0, | |
114 | NETLINK_CONNECTED, | |
115 | }; | |
116 | ||
bfa83a9e TG |
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 | { | |
128 | __u16 nla_len; | |
129 | __u16 nla_type; | |
130 | }; | |
131 | ||
132 | #define NLA_ALIGNTO 4 | |
133 | #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) | |
134 | #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) | |
135 | ||
1da177e4 LT |
136 | #ifdef __KERNEL__ |
137 | ||
138 | #include <linux/capability.h> | |
139 | #include <linux/skbuff.h> | |
140 | ||
141 | struct netlink_skb_parms | |
142 | { | |
143 | struct ucred creds; /* Skb credentials */ | |
144 | __u32 pid; | |
d629b836 | 145 | __u32 dst_group; |
1da177e4 | 146 | kernel_cap_t eff_cap; |
c94c257c | 147 | __u32 loginuid; /* Login (audit) uid */ |
e7c34970 | 148 | __u32 sid; /* SELinux security id */ |
1da177e4 LT |
149 | }; |
150 | ||
151 | #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) | |
152 | #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) | |
153 | ||
154 | ||
06628607 | 155 | extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module); |
1da177e4 | 156 | extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); |
4277a083 | 157 | extern int netlink_has_listeners(struct sock *sk, unsigned int group); |
1da177e4 LT |
158 | extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); |
159 | extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, | |
dd0fc66f | 160 | __u32 group, gfp_t allocation); |
1da177e4 LT |
161 | extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); |
162 | extern int netlink_register_notifier(struct notifier_block *nb); | |
163 | extern int netlink_unregister_notifier(struct notifier_block *nb); | |
164 | ||
165 | /* finegrained unicast helpers: */ | |
166 | struct sock *netlink_getsockbyfilp(struct file *filp); | |
a70ea994 AK |
167 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, |
168 | long timeo, struct sock *ssk); | |
1da177e4 LT |
169 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb); |
170 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); | |
171 | ||
172 | /* | |
173 | * skb should fit one page. This choice is good for headerless malloc. | |
fc910a27 DM |
174 | * But we should limit to 8K so that userspace does not have to |
175 | * use enormous buffer sizes on recvmsg() calls just to avoid | |
176 | * MSG_TRUNC when PAGE_SIZE is very large. | |
1da177e4 | 177 | */ |
fc910a27 DM |
178 | #if PAGE_SIZE < 8192UL |
179 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) | |
180 | #else | |
181 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) | |
182 | #endif | |
183 | ||
339bf98f | 184 | #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) |
1da177e4 LT |
185 | |
186 | ||
187 | struct netlink_callback | |
188 | { | |
189 | struct sk_buff *skb; | |
190 | struct nlmsghdr *nlh; | |
191 | int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); | |
192 | int (*done)(struct netlink_callback *cb); | |
193 | int family; | |
18b504e2 | 194 | long args[5]; |
1da177e4 LT |
195 | }; |
196 | ||
197 | struct netlink_notify | |
198 | { | |
199 | int pid; | |
200 | int protocol; | |
201 | }; | |
202 | ||
203 | static __inline__ struct nlmsghdr * | |
1797754e | 204 | __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) |
1da177e4 LT |
205 | { |
206 | struct nlmsghdr *nlh; | |
207 | int size = NLMSG_LENGTH(len); | |
208 | ||
209 | nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); | |
210 | nlh->nlmsg_type = type; | |
211 | nlh->nlmsg_len = size; | |
1797754e | 212 | nlh->nlmsg_flags = flags; |
1da177e4 LT |
213 | nlh->nlmsg_pid = pid; |
214 | nlh->nlmsg_seq = seq; | |
b3563c4f | 215 | memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
1da177e4 LT |
216 | return nlh; |
217 | } | |
218 | ||
1797754e | 219 | #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ |
f88a10d6 TG |
220 | ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \ |
221 | goto nlmsg_failure; \ | |
1797754e TG |
222 | __nlmsg_put(skb, pid, seq, type, len, flags); }) |
223 | ||
224 | #define NLMSG_PUT(skb, pid, seq, type, len) \ | |
225 | NLMSG_NEW(skb, pid, seq, type, len, 0) | |
f88a10d6 | 226 | |
1797754e TG |
227 | #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \ |
228 | NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \ | |
229 | (cb)->nlh->nlmsg_seq, type, len, flags) | |
f88a10d6 TG |
230 | |
231 | #define NLMSG_END(skb, nlh) \ | |
27a884dc | 232 | ({ (nlh)->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)(nlh); \ |
f88a10d6 TG |
233 | (skb)->len; }) |
234 | ||
235 | #define NLMSG_CANCEL(skb, nlh) \ | |
236 | ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \ | |
237 | -1; }) | |
1da177e4 LT |
238 | |
239 | extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, | |
240 | struct nlmsghdr *nlh, | |
241 | int (*dump)(struct sk_buff *skb, struct netlink_callback*), | |
242 | int (*done)(struct netlink_callback*)); | |
243 | ||
244 | ||
245 | #define NL_NONROOT_RECV 0x1 | |
246 | #define NL_NONROOT_SEND 0x2 | |
247 | extern void netlink_set_nonroot(int protocol, unsigned flag); | |
248 | ||
249 | #endif /* __KERNEL__ */ | |
250 | ||
251 | #endif /* __LINUX_NETLINK_H */ |