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