1 #ifndef __LINUX_NETLINK_H
2 #define __LINUX_NETLINK_H
3
4 #define NETLINK_ROUTE 0 /* Routing/device hook */
5 #define NETLINK_SKIP 1 /* Reserved for ENskip */
6 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
7 #define NETLINK_FIREWALL 3 /* Firewalling hook */
8 #define NETLINK_TCPDIAG 4 /* TCP socket monitoring */
9 #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
10 #define NETLINK_ARPD 8
11 #define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */
12 #define NETLINK_IP6_FW 13
13 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */
14 #define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */
15
16 #define MAX_LINKS 32
17
18 struct sockaddr_nl
19 {
20 sa_family_t nl_family; /* AF_NETLINK */
21 unsigned short nl_pad; /* zero */
22 __u32 nl_pid; /* process pid */
23 __u32 nl_groups; /* multicast groups mask */
24 };
25
26 struct nlmsghdr
27 {
28 __u32 nlmsg_len; /* Length of message including header */
29 __u16 nlmsg_type; /* Message content */
30 __u16 nlmsg_flags; /* Additional flags */
31 __u32 nlmsg_seq; /* Sequence number */
32 __u32 nlmsg_pid; /* Sending process PID */
33 };
34
35 /* Flags values */
36
37 #define NLM_F_REQUEST 1 /* It is request message. */
38 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
39 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
40 #define NLM_F_ECHO 8 /* Echo this request */
41
42 /* Modifiers to GET request */
43 #define NLM_F_ROOT 0x100 /* specify tree root */
44 #define NLM_F_MATCH 0x200 /* return all matching */
45 #define NLM_F_ATOMIC 0x400 /* atomic GET */
46 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
47
48 /* Modifiers to NEW request */
49 #define NLM_F_REPLACE 0x100 /* Override existing */
50 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
51 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
52 #define NLM_F_APPEND 0x800 /* Add to end of list */
53
54 /*
55 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
56 4.4BSD CHANGE NLM_F_REPLACE
57
58 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
59 Append NLM_F_CREATE
60 Check NLM_F_EXCL
61 */
62
63 #define NLMSG_ALIGNTO 4
64 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
65 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
66 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
67 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
68 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
69 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
70 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
71 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
72 (nlh)->nlmsg_len <= (len))
73 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
74
75 #define NLMSG_NOOP 0x1 /* Nothing. */
76 #define NLMSG_ERROR 0x2 /* Error */
77 #define NLMSG_DONE 0x3 /* End of a dump */
78 #define NLMSG_OVERRUN 0x4 /* Data lost */
79
80 struct nlmsgerr
81 {
82 int error;
83 struct nlmsghdr msg;
84 };
85
86 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
87
88 #ifdef __KERNEL__
89
90 struct netlink_skb_parms
91 {
92 struct ucred creds; /* Skb credentials */
93 __u32 pid;
94 __u32 groups;
95 __u32 dst_pid;
96 __u32 dst_groups;
97 kernel_cap_t eff_cap;
98 };
99
100 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
101 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
102
103
104 extern int netlink_attach(int unit, int (*function)(int,struct sk_buff *skb));
105 extern void netlink_detach(int unit);
106 extern int netlink_post(int unit, struct sk_buff *skb);
107 extern int init_netlink(void);
108 extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len));
109 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
110 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
111 extern void netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
112 __u32 group, int allocation);
113 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
114 extern int netlink_register_notifier(struct notifier_block *nb);
115 extern int netlink_unregister_notifier(struct notifier_block *nb);
116 extern int netlink_proto_init(void);
117
118 /*
119 * skb should fit one page. This choice is good for headerless malloc.
120 */
121 #define NLMSG_GOODORDER 0
122 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
123
124
125 struct netlink_callback
126 {
127 struct sk_buff *skb;
128 struct nlmsghdr *nlh;
129 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
130 int (*done)(struct netlink_callback *cb);
131 int family;
132 long args[4];
133 };
134
135 struct netlink_notify
136 {
137 int pid;
138 int protocol;
139 };
140
141 static __inline__ struct nlmsghdr *
__nlmsg_put(struct sk_buff * skb,u32 pid,u32 seq,int type,int len)142 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len)
143 {
144 struct nlmsghdr *nlh;
145 int size = NLMSG_LENGTH(len);
146
147 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
148 nlh->nlmsg_type = type;
149 nlh->nlmsg_len = size;
150 nlh->nlmsg_flags = 0;
151 nlh->nlmsg_pid = pid;
152 nlh->nlmsg_seq = seq;
153 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
154 return nlh;
155 }
156
157 #define NLMSG_PUT(skb, pid, seq, type, len) \
158 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \
159 __nlmsg_put(skb, pid, seq, type, len); })
160
161 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
162 struct nlmsghdr *nlh,
163 int (*dump)(struct sk_buff *skb, struct netlink_callback*),
164 int (*done)(struct netlink_callback*));
165
166 #define NL_NONROOT_RECV 0x1
167 #define NL_NONROOT_SEND 0x2
168 extern void netlink_set_nonroot(int protocol, unsigned flag);
169
170
171 #endif /* __KERNEL__ */
172
173 #endif /* __LINUX_NETLINK_H */
174