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_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_NETFILTER 12 /* netfilter subsystem */
19 #define NETLINK_IP6_FW 13
20 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */
21 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
27 sa_family_t nl_family; /* AF_NETLINK */
28 unsigned short nl_pad; /* zero */
29 __u32 nl_pid; /* process pid */
30 __u32 nl_groups; /* multicast groups mask */
35 __u32 nlmsg_len; /* Length of message including header */
36 __u16 nlmsg_type; /* Message content */
37 __u16 nlmsg_flags; /* Additional flags */
38 __u32 nlmsg_seq; /* Sequence number */
39 __u32 nlmsg_pid; /* Sending process PID */
44 #define NLM_F_REQUEST 1 /* It is request message. */
45 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
46 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
47 #define NLM_F_ECHO 8 /* Echo this request */
49 /* Modifiers to GET request */
50 #define NLM_F_ROOT 0x100 /* specify tree root */
51 #define NLM_F_MATCH 0x200 /* return all matching */
52 #define NLM_F_ATOMIC 0x400 /* atomic GET */
53 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
55 /* Modifiers to NEW request */
56 #define NLM_F_REPLACE 0x100 /* Override existing */
57 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
58 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
59 #define NLM_F_APPEND 0x800 /* Add to end of list */
62 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
63 4.4BSD CHANGE NLM_F_REPLACE
65 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
70 #define NLMSG_ALIGNTO 4
71 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
72 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
73 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
74 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
75 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
76 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
77 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
78 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
79 (nlh)->nlmsg_len <= (len))
80 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
82 #define NLMSG_NOOP 0x1 /* Nothing. */
83 #define NLMSG_ERROR 0x2 /* Error */
84 #define NLMSG_DONE 0x3 /* End of a dump */
85 #define NLMSG_OVERRUN 0x4 /* Data lost */
93 #define NETLINK_ADD_MEMBERSHIP 1
94 #define NETLINK_DROP_MEMBERSHIP 2
95 #define NETLINK_PKTINFO 3
102 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
105 NETLINK_UNCONNECTED = 0,
111 #include <linux/capability.h>
112 #include <linux/skbuff.h>
114 struct netlink_skb_parms
116 struct ucred creds; /* Skb credentials */
120 kernel_cap_t eff_cap;
121 __u32 loginuid; /* Login (audit) uid */
124 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
125 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
128 extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
129 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
130 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
131 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
132 __u32 group, unsigned int __nocast allocation);
133 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
134 extern int netlink_register_notifier(struct notifier_block *nb);
135 extern int netlink_unregister_notifier(struct notifier_block *nb);
137 /* finegrained unicast helpers: */
138 struct sock *netlink_getsockbyfilp(struct file *filp);
139 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo);
140 void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
141 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
144 * skb should fit one page. This choice is good for headerless malloc.
146 #define NLMSG_GOODORDER 0
147 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
150 struct netlink_callback
153 struct nlmsghdr *nlh;
154 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
155 int (*done)(struct netlink_callback *cb);
160 struct netlink_notify
166 static __inline__ struct nlmsghdr *
167 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
169 struct nlmsghdr *nlh;
170 int size = NLMSG_LENGTH(len);
172 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
173 nlh->nlmsg_type = type;
174 nlh->nlmsg_len = size;
175 nlh->nlmsg_flags = flags;
176 nlh->nlmsg_pid = pid;
177 nlh->nlmsg_seq = seq;
178 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
182 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
183 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
184 goto nlmsg_failure; \
185 __nlmsg_put(skb, pid, seq, type, len, flags); })
187 #define NLMSG_PUT(skb, pid, seq, type, len) \
188 NLMSG_NEW(skb, pid, seq, type, len, 0)
190 #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
191 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
192 (cb)->nlh->nlmsg_seq, type, len, flags)
194 #define NLMSG_END(skb, nlh) \
195 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
198 #define NLMSG_CANCEL(skb, nlh) \
199 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
202 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
203 struct nlmsghdr *nlh,
204 int (*dump)(struct sk_buff *skb, struct netlink_callback*),
205 int (*done)(struct netlink_callback*));
208 #define NL_NONROOT_RECV 0x1
209 #define NL_NONROOT_SEND 0x2
210 extern void netlink_set_nonroot(int protocol, unsigned flag);
212 #endif /* __KERNEL__ */
214 #endif /* __LINUX_NETLINK_H */