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1 | #ifndef __LINUX_NETLINK_H |
2 | #define __LINUX_NETLINK_H | |
3 | ||
4 | #include <linux/socket.h> /* for sa_family_t */ | |
5 | #include <linux/types.h> | |
6 | ||
7 | #define NETLINK_ROUTE 0 /* Routing/device hook */ | |
8 | #define NETLINK_SKIP 1 /* Reserved for ENskip */ | |
9 | #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ | |
10 | #define NETLINK_FIREWALL 3 /* Firewalling hook */ | |
11 | #define NETLINK_TCPDIAG 4 /* TCP 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_ARPD 8 | |
16 | #define NETLINK_AUDIT 9 /* auditing */ | |
17 | #define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */ | |
18 | #define NETLINK_IP6_FW 13 | |
19 | #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ | |
20 | #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ | |
21 | #define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */ | |
22 | ||
23 | #define MAX_LINKS 32 | |
24 | ||
25 | struct sockaddr_nl | |
26 | { | |
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 */ | |
31 | }; | |
32 | ||
33 | struct nlmsghdr | |
34 | { | |
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 */ | |
40 | }; | |
41 | ||
42 | /* Flags values */ | |
43 | ||
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 */ | |
48 | ||
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) | |
54 | ||
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 */ | |
60 | ||
61 | /* | |
62 | 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL | |
63 | 4.4BSD CHANGE NLM_F_REPLACE | |
64 | ||
65 | True CHANGE NLM_F_CREATE|NLM_F_REPLACE | |
66 | Append NLM_F_CREATE | |
67 | Check NLM_F_EXCL | |
68 | */ | |
69 | ||
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))) | |
81 | ||
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 */ | |
86 | ||
87 | struct nlmsgerr | |
88 | { | |
89 | int error; | |
90 | struct nlmsghdr msg; | |
91 | }; | |
92 | ||
93 | #define NET_MAJOR 36 /* Major 36 is reserved for networking */ | |
94 | ||
95 | enum { | |
96 | NETLINK_UNCONNECTED = 0, | |
97 | NETLINK_CONNECTED, | |
98 | }; | |
99 | ||
100 | #ifdef __KERNEL__ | |
101 | ||
102 | #include <linux/capability.h> | |
103 | #include <linux/skbuff.h> | |
104 | ||
105 | struct netlink_skb_parms | |
106 | { | |
107 | struct ucred creds; /* Skb credentials */ | |
108 | __u32 pid; | |
109 | __u32 groups; | |
110 | __u32 dst_pid; | |
111 | __u32 dst_groups; | |
112 | kernel_cap_t eff_cap; | |
c94c257c | 113 | __u32 loginuid; /* Login (audit) uid */ |
1da177e4 LT |
114 | }; |
115 | ||
116 | #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) | |
117 | #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) | |
118 | ||
119 | ||
120 | extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len)); | |
121 | extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); | |
122 | extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); | |
123 | extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, | |
124 | __u32 group, int allocation); | |
125 | extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); | |
126 | extern int netlink_register_notifier(struct notifier_block *nb); | |
127 | extern int netlink_unregister_notifier(struct notifier_block *nb); | |
128 | ||
129 | /* finegrained unicast helpers: */ | |
130 | struct sock *netlink_getsockbyfilp(struct file *filp); | |
131 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo); | |
132 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb); | |
133 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); | |
134 | ||
135 | /* | |
136 | * skb should fit one page. This choice is good for headerless malloc. | |
137 | */ | |
138 | #define NLMSG_GOODORDER 0 | |
139 | #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER)) | |
140 | ||
141 | ||
142 | struct netlink_callback | |
143 | { | |
144 | struct sk_buff *skb; | |
145 | struct nlmsghdr *nlh; | |
146 | int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); | |
147 | int (*done)(struct netlink_callback *cb); | |
148 | int family; | |
149 | long args[4]; | |
150 | }; | |
151 | ||
152 | struct netlink_notify | |
153 | { | |
154 | int pid; | |
155 | int protocol; | |
156 | }; | |
157 | ||
158 | static __inline__ struct nlmsghdr * | |
159 | __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len) | |
160 | { | |
161 | struct nlmsghdr *nlh; | |
162 | int size = NLMSG_LENGTH(len); | |
163 | ||
164 | nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); | |
165 | nlh->nlmsg_type = type; | |
166 | nlh->nlmsg_len = size; | |
167 | nlh->nlmsg_flags = 0; | |
168 | nlh->nlmsg_pid = pid; | |
169 | nlh->nlmsg_seq = seq; | |
170 | return nlh; | |
171 | } | |
172 | ||
173 | #define NLMSG_PUT(skb, pid, seq, type, len) \ | |
174 | ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \ | |
175 | __nlmsg_put(skb, pid, seq, type, len); }) | |
176 | ||
177 | extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, | |
178 | struct nlmsghdr *nlh, | |
179 | int (*dump)(struct sk_buff *skb, struct netlink_callback*), | |
180 | int (*done)(struct netlink_callback*)); | |
181 | ||
182 | ||
183 | #define NL_NONROOT_RECV 0x1 | |
184 | #define NL_NONROOT_SEND 0x2 | |
185 | extern void netlink_set_nonroot(int protocol, unsigned flag); | |
186 | ||
187 | #endif /* __KERNEL__ */ | |
188 | ||
189 | #endif /* __LINUX_NETLINK_H */ |