Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _UAPI__LINUX_NETLINK_H
2#define _UAPI__LINUX_NETLINK_H
3
4#include <linux/kernel.h>
5#include <linux/socket.h> /* for __kernel_sa_family_t */
6#include <linux/types.h>
7
8#define NETLINK_ROUTE 0 /* Routing/device hook */
9#define NETLINK_UNUSED 1 /* Unused number */
10#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
11#define NETLINK_FIREWALL 3 /* Unused number, formerly ip_queue */
12#define NETLINK_SOCK_DIAG 4 /* socket monitoring */
13#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
14#define NETLINK_XFRM 6 /* ipsec */
15#define NETLINK_SELINUX 7 /* SELinux event notifications */
16#define NETLINK_ISCSI 8 /* Open-iSCSI */
17#define NETLINK_AUDIT 9 /* auditing */
18#define NETLINK_FIB_LOOKUP 10
19#define NETLINK_CONNECTOR 11
20#define NETLINK_NETFILTER 12 /* netfilter subsystem */
21#define NETLINK_IP6_FW 13
22#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
23#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
24#define NETLINK_GENERIC 16
25/* leave room for NETLINK_DM (DM Events) */
26#define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */
27#define NETLINK_ECRYPTFS 19
28#define NETLINK_RDMA 20
29#define NETLINK_CRYPTO 21 /* Crypto layer */
30#define NETLINK_SMC 22 /* SMC monitoring */
31
32#define NETLINK_INET_DIAG NETLINK_SOCK_DIAG
33
34#define MAX_LINKS 32
35
36struct sockaddr_nl {
37 __kernel_sa_family_t nl_family; /* AF_NETLINK */
38 unsigned short nl_pad; /* zero */
39 __u32 nl_pid; /* port ID */
40 __u32 nl_groups; /* multicast groups mask */
41};
42
43struct nlmsghdr {
44 __u32 nlmsg_len; /* Length of message including header */
45 __u16 nlmsg_type; /* Message content */
46 __u16 nlmsg_flags; /* Additional flags */
47 __u32 nlmsg_seq; /* Sequence number */
48 __u32 nlmsg_pid; /* Sending process port ID */
49};
50
51/* Flags values */
52
53#define NLM_F_REQUEST 0x01 /* It is request message. */
54#define NLM_F_MULTI 0x02 /* Multipart message, terminated by NLMSG_DONE */
55#define NLM_F_ACK 0x04 /* Reply with ack, with zero or error code */
56#define NLM_F_ECHO 0x08 /* Echo this request */
57#define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */
58#define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */
59
60/* Modifiers to GET request */
61#define NLM_F_ROOT 0x100 /* specify tree root */
62#define NLM_F_MATCH 0x200 /* return all matching */
63#define NLM_F_ATOMIC 0x400 /* atomic GET */
64#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
65
66/* Modifiers to NEW request */
67#define NLM_F_REPLACE 0x100 /* Override existing */
68#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
69#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
70#define NLM_F_APPEND 0x800 /* Add to end of list */
71
72/* Modifiers to DELETE request */
73#define NLM_F_NONREC 0x100 /* Do not delete recursively */
74
75/* Flags for ACK message */
76#define NLM_F_CAPPED 0x100 /* request was capped */
77#define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
78
79/*
80 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
81 4.4BSD CHANGE NLM_F_REPLACE
82
83 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
84 Append NLM_F_CREATE
85 Check NLM_F_EXCL
86 */
87
88#define NLMSG_ALIGNTO 4U
89#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
90#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
91#define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
92#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
93#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
94#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
95 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
96#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
97 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
98 (nlh)->nlmsg_len <= (len))
99#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
100
101#define NLMSG_NOOP 0x1 /* Nothing. */
102#define NLMSG_ERROR 0x2 /* Error */
103#define NLMSG_DONE 0x3 /* End of a dump */
104#define NLMSG_OVERRUN 0x4 /* Data lost */
105
106#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
107
108struct nlmsgerr {
109 int error;
110 struct nlmsghdr msg;
111 /*
112 * followed by the message contents unless NETLINK_CAP_ACK was set
113 * or the ACK indicates success (error == 0)
114 * message length is aligned with NLMSG_ALIGN()
115 */
116 /*
117 * followed by TLVs defined in enum nlmsgerr_attrs
118 * if NETLINK_EXT_ACK was set
119 */
120};
121
122/**
123 * enum nlmsgerr_attrs - nlmsgerr attributes
124 * @NLMSGERR_ATTR_UNUSED: unused
125 * @NLMSGERR_ATTR_MSG: error message string (string)
126 * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original
127 * message, counting from the beginning of the header (u32)
128 * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to
129 * be used - in the success case - to identify a created
130 * object or operation or similar (binary)
131 * @__NLMSGERR_ATTR_MAX: number of attributes
132 * @NLMSGERR_ATTR_MAX: highest attribute number
133 */
134enum nlmsgerr_attrs {
135 NLMSGERR_ATTR_UNUSED,
136 NLMSGERR_ATTR_MSG,
137 NLMSGERR_ATTR_OFFS,
138 NLMSGERR_ATTR_COOKIE,
139
140 __NLMSGERR_ATTR_MAX,
141 NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
142};
143
144#define NETLINK_ADD_MEMBERSHIP 1
145#define NETLINK_DROP_MEMBERSHIP 2
146#define NETLINK_PKTINFO 3
147#define NETLINK_BROADCAST_ERROR 4
148#define NETLINK_NO_ENOBUFS 5
149#ifndef __KERNEL__
150#define NETLINK_RX_RING 6
151#define NETLINK_TX_RING 7
152#endif
153#define NETLINK_LISTEN_ALL_NSID 8
154#define NETLINK_LIST_MEMBERSHIPS 9
155#define NETLINK_CAP_ACK 10
156#define NETLINK_EXT_ACK 11
157
158struct nl_pktinfo {
159 __u32 group;
160};
161
162struct nl_mmap_req {
163 unsigned int nm_block_size;
164 unsigned int nm_block_nr;
165 unsigned int nm_frame_size;
166 unsigned int nm_frame_nr;
167};
168
169struct nl_mmap_hdr {
170 unsigned int nm_status;
171 unsigned int nm_len;
172 __u32 nm_group;
173 /* credentials */
174 __u32 nm_pid;
175 __u32 nm_uid;
176 __u32 nm_gid;
177};
178
179#ifndef __KERNEL__
180enum nl_mmap_status {
181 NL_MMAP_STATUS_UNUSED,
182 NL_MMAP_STATUS_RESERVED,
183 NL_MMAP_STATUS_VALID,
184 NL_MMAP_STATUS_COPY,
185 NL_MMAP_STATUS_SKIP,
186};
187
188#define NL_MMAP_MSG_ALIGNMENT NLMSG_ALIGNTO
189#define NL_MMAP_MSG_ALIGN(sz) __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
190#define NL_MMAP_HDRLEN NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
191#endif
192
193#define NET_MAJOR 36 /* Major 36 is reserved for networking */
194
195enum {
196 NETLINK_UNCONNECTED = 0,
197 NETLINK_CONNECTED,
198};
199
200/*
201 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
202 * +---------------------+- - -+- - - - - - - - - -+- - -+
203 * | Header | Pad | Payload | Pad |
204 * | (struct nlattr) | ing | | ing |
205 * +---------------------+- - -+- - - - - - - - - -+- - -+
206 * <-------------- nlattr->nla_len -------------->
207 */
208
209struct nlattr {
210 __u16 nla_len;
211 __u16 nla_type;
212};
213
214/*
215 * nla_type (16 bits)
216 * +---+---+-------------------------------+
217 * | N | O | Attribute Type |
218 * +---+---+-------------------------------+
219 * N := Carries nested attributes
220 * O := Payload stored in network byte order
221 *
222 * Note: The N and O flag are mutually exclusive.
223 */
224#define NLA_F_NESTED (1 << 15)
225#define NLA_F_NET_BYTEORDER (1 << 14)
226#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
227
228#define NLA_ALIGNTO 4
229#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
230#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
231
232/* Generic 32 bitflags attribute content sent to the kernel.
233 *
234 * The value is a bitmap that defines the values being set
235 * The selector is a bitmask that defines which value is legit
236 *
237 * Examples:
238 * value = 0x0, and selector = 0x1
239 * implies we are selecting bit 1 and we want to set its value to 0.
240 *
241 * value = 0x2, and selector = 0x2
242 * implies we are selecting bit 2 and we want to set its value to 1.
243 *
244 */
245struct nla_bitfield32 {
246 __u32 value;
247 __u32 selector;
248};
249
250#endif /* _UAPI__LINUX_NETLINK_H */