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1da177e4 LT |
1 | #ifndef __LINUX_NETLINK_H |
2 | #define __LINUX_NETLINK_H | |
3 | ||
bcb949b8 | 4 | #include <linux/socket.h> /* for __kernel_sa_family_t */ |
1da177e4 LT |
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 |
b2cbae2c | 27 | #define NETLINK_RDMA 20 |
a38f7907 | 28 | #define NETLINK_CRYPTO 21 /* Crypto layer */ |
1da177e4 LT |
29 | |
30 | #define MAX_LINKS 32 | |
31 | ||
d94d9fee | 32 | struct sockaddr_nl { |
6602a4ba | 33 | __kernel_sa_family_t nl_family; /* AF_NETLINK */ |
1da177e4 | 34 | unsigned short nl_pad; /* zero */ |
cf130cb1 | 35 | __u32 nl_pid; /* port ID */ |
1da177e4 LT |
36 | __u32 nl_groups; /* multicast groups mask */ |
37 | }; | |
38 | ||
d94d9fee | 39 | struct nlmsghdr { |
1da177e4 LT |
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 */ | |
cf130cb1 | 44 | __u32 nlmsg_pid; /* Sending process port ID */ |
1da177e4 LT |
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 */ | |
670dc283 | 53 | #define NLM_F_DUMP_INTR 16 /* Dump was inconsistent due to sequence change */ |
1da177e4 LT |
54 | |
55 | /* Modifiers to GET request */ | |
56 | #define NLM_F_ROOT 0x100 /* specify tree root */ | |
57 | #define NLM_F_MATCH 0x200 /* return all matching */ | |
58 | #define NLM_F_ATOMIC 0x400 /* atomic GET */ | |
59 | #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) | |
60 | ||
61 | /* Modifiers to NEW request */ | |
62 | #define NLM_F_REPLACE 0x100 /* Override existing */ | |
63 | #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ | |
64 | #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ | |
65 | #define NLM_F_APPEND 0x800 /* Add to end of list */ | |
66 | ||
67 | /* | |
68 | 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL | |
69 | 4.4BSD CHANGE NLM_F_REPLACE | |
70 | ||
71 | True CHANGE NLM_F_CREATE|NLM_F_REPLACE | |
72 | Append NLM_F_CREATE | |
73 | Check NLM_F_EXCL | |
74 | */ | |
75 | ||
4b8fe663 | 76 | #define NLMSG_ALIGNTO 4U |
1da177e4 | 77 | #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) |
bfa83a9e TG |
78 | #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) |
79 | #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) | |
1da177e4 LT |
80 | #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) |
81 | #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) | |
82 | #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ | |
83 | (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) | |
84 | #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ | |
85 | (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ | |
86 | (nlh)->nlmsg_len <= (len)) | |
87 | #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) | |
88 | ||
89 | #define NLMSG_NOOP 0x1 /* Nothing. */ | |
90 | #define NLMSG_ERROR 0x2 /* Error */ | |
91 | #define NLMSG_DONE 0x3 /* End of a dump */ | |
92 | #define NLMSG_OVERRUN 0x4 /* Data lost */ | |
93 | ||
bfa83a9e TG |
94 | #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ |
95 | ||
d94d9fee | 96 | struct nlmsgerr { |
1da177e4 LT |
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 | |
be0c22a4 | 104 | #define NETLINK_BROADCAST_ERROR 4 |
38938bfe | 105 | #define NETLINK_NO_ENOBUFS 5 |
9a4595bc | 106 | |
d94d9fee | 107 | struct nl_pktinfo { |
9a4595bc PM |
108 | __u32 group; |
109 | }; | |
110 | ||
1da177e4 LT |
111 | #define NET_MAJOR 36 /* Major 36 is reserved for networking */ |
112 | ||
113 | enum { | |
114 | NETLINK_UNCONNECTED = 0, | |
115 | NETLINK_CONNECTED, | |
116 | }; | |
117 | ||
bfa83a9e TG |
118 | /* |
119 | * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> | |
120 | * +---------------------+- - -+- - - - - - - - - -+- - -+ | |
121 | * | Header | Pad | Payload | Pad | | |
122 | * | (struct nlattr) | ing | | ing | | |
123 | * +---------------------+- - -+- - - - - - - - - -+- - -+ | |
124 | * <-------------- nlattr->nla_len --------------> | |
125 | */ | |
126 | ||
d94d9fee | 127 | struct nlattr { |
bfa83a9e TG |
128 | __u16 nla_len; |
129 | __u16 nla_type; | |
130 | }; | |
131 | ||
8f4c1f9b TG |
132 | /* |
133 | * nla_type (16 bits) | |
134 | * +---+---+-------------------------------+ | |
135 | * | N | O | Attribute Type | | |
136 | * +---+---+-------------------------------+ | |
137 | * N := Carries nested attributes | |
138 | * O := Payload stored in network byte order | |
139 | * | |
140 | * Note: The N and O flag are mutually exclusive. | |
141 | */ | |
142 | #define NLA_F_NESTED (1 << 15) | |
143 | #define NLA_F_NET_BYTEORDER (1 << 14) | |
144 | #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) | |
145 | ||
bfa83a9e TG |
146 | #define NLA_ALIGNTO 4 |
147 | #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) | |
148 | #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) | |
149 | ||
1da177e4 LT |
150 | #ifdef __KERNEL__ |
151 | ||
152 | #include <linux/capability.h> | |
153 | #include <linux/skbuff.h> | |
154 | ||
56b49f4b OW |
155 | struct net; |
156 | ||
b529ccf2 ACM |
157 | static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) |
158 | { | |
159 | return (struct nlmsghdr *)skb->data; | |
160 | } | |
161 | ||
d94d9fee | 162 | struct netlink_skb_parms { |
1da177e4 LT |
163 | struct ucred creds; /* Skb credentials */ |
164 | __u32 pid; | |
d629b836 | 165 | __u32 dst_group; |
1da177e4 LT |
166 | }; |
167 | ||
168 | #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) | |
169 | #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) | |
170 | ||
171 | ||
d136f1bd JB |
172 | extern void netlink_table_grab(void); |
173 | extern void netlink_table_ungrab(void); | |
174 | ||
b4b51029 EB |
175 | extern struct sock *netlink_kernel_create(struct net *net, |
176 | int unit,unsigned int groups, | |
cd40b7d3 | 177 | void (*input)(struct sk_buff *skb), |
af65bdfc PM |
178 | struct mutex *cb_mutex, |
179 | struct module *module); | |
b7c6ba6e | 180 | extern void netlink_kernel_release(struct sock *sk); |
d136f1bd | 181 | extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); |
b4ff4f04 | 182 | extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); |
b8273570 | 183 | extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
84659eb5 | 184 | extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
1da177e4 | 185 | extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); |
4277a083 | 186 | extern int netlink_has_listeners(struct sock *sk, unsigned int group); |
1da177e4 LT |
187 | extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); |
188 | extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, | |
dd0fc66f | 189 | __u32 group, gfp_t allocation); |
910a7e90 EB |
190 | extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, |
191 | __u32 pid, __u32 group, gfp_t allocation, | |
192 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), | |
193 | void *filter_data); | |
1a50307b | 194 | extern int netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); |
1da177e4 LT |
195 | extern int netlink_register_notifier(struct notifier_block *nb); |
196 | extern int netlink_unregister_notifier(struct notifier_block *nb); | |
197 | ||
198 | /* finegrained unicast helpers: */ | |
199 | struct sock *netlink_getsockbyfilp(struct file *filp); | |
9457afee | 200 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
c3d8d1e3 | 201 | long *timeo, struct sock *ssk); |
1da177e4 | 202 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb); |
7ee015e0 | 203 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
204 | |
205 | /* | |
206 | * skb should fit one page. This choice is good for headerless malloc. | |
fc910a27 DM |
207 | * But we should limit to 8K so that userspace does not have to |
208 | * use enormous buffer sizes on recvmsg() calls just to avoid | |
209 | * MSG_TRUNC when PAGE_SIZE is very large. | |
1da177e4 | 210 | */ |
fc910a27 DM |
211 | #if PAGE_SIZE < 8192UL |
212 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) | |
213 | #else | |
214 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) | |
215 | #endif | |
216 | ||
339bf98f | 217 | #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) |
1da177e4 LT |
218 | |
219 | ||
d94d9fee | 220 | struct netlink_callback { |
3a6c2b41 PM |
221 | struct sk_buff *skb; |
222 | const struct nlmsghdr *nlh; | |
223 | int (*dump)(struct sk_buff * skb, | |
224 | struct netlink_callback *cb); | |
225 | int (*done)(struct netlink_callback *cb); | |
c7ac8679 GR |
226 | u16 family; |
227 | u16 min_dump_alloc; | |
670dc283 | 228 | unsigned int prev_seq, seq; |
3a6c2b41 | 229 | long args[6]; |
1da177e4 LT |
230 | }; |
231 | ||
d94d9fee | 232 | struct netlink_notify { |
b4b51029 | 233 | struct net *net; |
1da177e4 LT |
234 | int pid; |
235 | int protocol; | |
236 | }; | |
237 | ||
238 | static __inline__ struct nlmsghdr * | |
1797754e | 239 | __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) |
1da177e4 LT |
240 | { |
241 | struct nlmsghdr *nlh; | |
242 | int size = NLMSG_LENGTH(len); | |
243 | ||
244 | nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); | |
245 | nlh->nlmsg_type = type; | |
246 | nlh->nlmsg_len = size; | |
1797754e | 247 | nlh->nlmsg_flags = flags; |
1da177e4 LT |
248 | nlh->nlmsg_pid = pid; |
249 | nlh->nlmsg_seq = seq; | |
0c19b0ad PM |
250 | if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) |
251 | memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); | |
1da177e4 LT |
252 | return nlh; |
253 | } | |
254 | ||
1797754e | 255 | #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ |
f4d900a2 | 256 | ({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \ |
f88a10d6 | 257 | goto nlmsg_failure; \ |
1797754e TG |
258 | __nlmsg_put(skb, pid, seq, type, len, flags); }) |
259 | ||
260 | #define NLMSG_PUT(skb, pid, seq, type, len) \ | |
261 | NLMSG_NEW(skb, pid, seq, type, len, 0) | |
f88a10d6 | 262 | |
1da177e4 | 263 | extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
3a6c2b41 | 264 | const struct nlmsghdr *nlh, |
1da177e4 | 265 | int (*dump)(struct sk_buff *skb, struct netlink_callback*), |
c7ac8679 GR |
266 | int (*done)(struct netlink_callback*), |
267 | u16 min_dump_alloc); | |
1da177e4 LT |
268 | |
269 | ||
270 | #define NL_NONROOT_RECV 0x1 | |
271 | #define NL_NONROOT_SEND 0x2 | |
272 | extern void netlink_set_nonroot(int protocol, unsigned flag); | |
273 | ||
274 | #endif /* __KERNEL__ */ | |
275 | ||
276 | #endif /* __LINUX_NETLINK_H */ |