1 #ifndef __LINUX_NETLINK_H
2 #define __LINUX_NETLINK_H
4 #include <linux/socket.h> /* for sa_family_t */
5 #include <linux/types.h>
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
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 */
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 */
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 */
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)
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 */
67 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
68 4.4BSD CHANGE NLM_F_REPLACE
70 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
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)))
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 */
93 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
101 #define NETLINK_ADD_MEMBERSHIP 1
102 #define NETLINK_DROP_MEMBERSHIP 2
103 #define NETLINK_PKTINFO 3
110 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
113 NETLINK_UNCONNECTED = 0,
118 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
119 * +---------------------+- - -+- - - - - - - - - -+- - -+
120 * | Header | Pad | Payload | Pad |
121 * | (struct nlattr) | ing | | ing |
122 * +---------------------+- - -+- - - - - - - - - -+- - -+
123 * <-------------- nlattr->nla_len -------------->
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)))
138 #include <linux/capability.h>
139 #include <linux/skbuff.h>
141 struct netlink_skb_parms
143 struct ucred creds; /* Skb credentials */
146 kernel_cap_t eff_cap;
147 __u32 loginuid; /* Login (audit) uid */
148 __u32 sid; /* SELinux security id */
151 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
152 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
155 extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
156 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
157 extern int netlink_has_listeners(struct sock *sk, unsigned int group);
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,
160 __u32 group, gfp_t allocation);
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);
165 /* finegrained unicast helpers: */
166 struct sock *netlink_getsockbyfilp(struct file *filp);
167 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
168 long timeo, struct sock *ssk);
169 void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
170 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
173 * skb should fit one page. This choice is good for headerless malloc.
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.
178 #if PAGE_SIZE < 8192UL
179 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
181 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
184 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
187 struct netlink_callback
190 struct nlmsghdr *nlh;
191 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
192 int (*done)(struct netlink_callback *cb);
197 struct netlink_notify
203 static __inline__ struct nlmsghdr *
204 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
206 struct nlmsghdr *nlh;
207 int size = NLMSG_LENGTH(len);
209 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
210 nlh->nlmsg_type = type;
211 nlh->nlmsg_len = size;
212 nlh->nlmsg_flags = flags;
213 nlh->nlmsg_pid = pid;
214 nlh->nlmsg_seq = seq;
215 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
219 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
220 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
221 goto nlmsg_failure; \
222 __nlmsg_put(skb, pid, seq, type, len, flags); })
224 #define NLMSG_PUT(skb, pid, seq, type, len) \
225 NLMSG_NEW(skb, pid, seq, type, len, 0)
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)
231 #define NLMSG_END(skb, nlh) \
232 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
235 #define NLMSG_CANCEL(skb, nlh) \
236 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
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*));
245 #define NL_NONROOT_RECV 0x1
246 #define NL_NONROOT_SEND 0x2
247 extern void netlink_set_nonroot(int protocol, unsigned flag);
249 #endif /* __KERNEL__ */
251 #endif /* __LINUX_NETLINK_H */