4289ce937f01704e3b9f2489de3d9a086765f6ae
[strongswan.git] / src / include / linux / netlink.h
1 #ifndef __LINUX_NETLINK_H
2 #define __LINUX_NETLINK_H
3
4 #include <stdint.h>
5 #include <sys/socket.h> /* for sa_family_t */
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
27 struct sockaddr_nl
28 {
29 sa_family_t nl_family; /* AF_NETLINK */
30 unsigned short nl_pad; /* zero */
31 uint32_t nl_pid; /* process pid */
32 uint32_t nl_groups; /* multicast groups mask */
33 };
34
35 struct nlmsghdr
36 {
37 uint32_t nlmsg_len; /* Length of message including header */
38 uint16_t nlmsg_type; /* Message content */
39 uint16_t nlmsg_flags; /* Additional flags */
40 uint32_t nlmsg_seq; /* Sequence number */
41 uint32_t 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
92 struct 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
102 struct nl_pktinfo
103 {
104 uint32_t group;
105 };
106
107 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
108
109 enum {
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
123 struct nlattr
124 {
125 uint16_t nla_len;
126 uint16_t 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 struct netlink_skb_parms
136 {
137 struct ucred creds; /* Skb credentials */
138 uint32_t pid;
139 uint32_t dst_pid;
140 uint32_t dst_group;
141 kernel_cap_t eff_cap;
142 uint32_t loginuid; /* Login (audit) uid */
143 uint32_t sid; /* SELinux security id */
144 };
145
146 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
147 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
148
149
150 extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
151 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
152 extern int netlink_has_listeners(struct sock *sk, unsigned int group);
153 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, uint32_t pid, int nonblock);
154 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, uint32_t pid,
155 uint32_t group, gfp_t allocation);
156 extern void netlink_set_err(struct sock *ssk, uint32_t pid, uint32_t group, int code);
157 extern int netlink_register_notifier(struct notifier_block *nb);
158 extern int netlink_unregister_notifier(struct notifier_block *nb);
159
160 /* finegrained unicast helpers: */
161 struct sock *netlink_getsockbyfilp(struct file *filp);
162 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
163 long timeo, struct sock *ssk);
164 void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
165 int 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
174 struct 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
184 struct netlink_notify
185 {
186 int pid;
187 int protocol;
188 };
189
190 static __inline__ struct nlmsghdr *
191 __nlmsg_put(struct sk_buff *skb, uint32_t pid, uint32_t 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
226 extern 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
234 extern void netlink_set_nonroot(int protocol, unsigned flag);
235
236 #endif /* __KERNEL__ */
237
238 #endif /* __LINUX_NETLINK_H */