1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI__LINUX_NETLINK_H
3 #define _UAPI__LINUX_NETLINK_H
4
5 #include <linux/kernel.h>
6 #include <linux/socket.h> /* for __kernel_sa_family_t */
7 #include <linux/types.h>
8
9 #define NETLINK_ROUTE 0 /* Routing/device hook */
10 #define NETLINK_UNUSED 1 /* Unused number */
11 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
12 #define NETLINK_FIREWALL 3 /* Unused number, formerly ip_queue */
13 #define NETLINK_SOCK_DIAG 4 /* socket monitoring */
14 #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
15 #define NETLINK_XFRM 6 /* ipsec */
16 #define NETLINK_SELINUX 7 /* SELinux event notifications */
17 #define NETLINK_ISCSI 8 /* Open-iSCSI */
18 #define NETLINK_AUDIT 9 /* auditing */
19 #define NETLINK_FIB_LOOKUP 10
20 #define NETLINK_CONNECTOR 11
21 #define NETLINK_NETFILTER 12 /* netfilter subsystem */
22 #define NETLINK_IP6_FW 13
23 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */
24 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
25 #define NETLINK_GENERIC 16
26 /* leave room for NETLINK_DM (DM Events) */
27 #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */
28 #define NETLINK_ECRYPTFS 19
29 #define NETLINK_RDMA 20
30 #define NETLINK_CRYPTO 21 /* Crypto layer */
31 #define NETLINK_SMC 22 /* SMC monitoring */
32
33 #define NETLINK_INET_DIAG NETLINK_SOCK_DIAG
34
35 #define MAX_LINKS 32
36
37 struct sockaddr_nl {
38 __kernel_sa_family_t nl_family; /* AF_NETLINK */
39 unsigned short nl_pad; /* zero */
40 __u32 nl_pid; /* port ID */
41 __u32 nl_groups; /* multicast groups mask */
42 };
43
44 struct nlmsghdr {
45 __u32 nlmsg_len; /* Length of message including header */
46 __u16 nlmsg_type; /* Message content */
47 __u16 nlmsg_flags; /* Additional flags */
48 __u32 nlmsg_seq; /* Sequence number */
49 __u32 nlmsg_pid; /* Sending process port ID */
50 };
51
52 /* Flags values */
53
54 #define NLM_F_REQUEST 0x01 /* It is request message. */
55 #define NLM_F_MULTI 0x02 /* Multipart message, terminated by NLMSG_DONE */
56 #define NLM_F_ACK 0x04 /* Reply with ack, with zero or error code */
57 #define NLM_F_ECHO 0x08 /* Echo this request */
58 #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */
59 #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */
60
61 /* Modifiers to GET request */
62 #define NLM_F_ROOT 0x100 /* specify tree root */
63 #define NLM_F_MATCH 0x200 /* return all matching */
64 #define NLM_F_ATOMIC 0x400 /* atomic GET */
65 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
66
67 /* Modifiers to NEW request */
68 #define NLM_F_REPLACE 0x100 /* Override existing */
69 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
70 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
71 #define NLM_F_APPEND 0x800 /* Add to end of list */
72
73 /* Modifiers to DELETE request */
74 #define NLM_F_NONREC 0x100 /* Do not delete recursively */
75
76 /* Flags for ACK message */
77 #define NLM_F_CAPPED 0x100 /* request was capped */
78 #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
79
80 /*
81 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
82 4.4BSD CHANGE NLM_F_REPLACE
83
84 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
85 Append NLM_F_CREATE
86 Check NLM_F_EXCL
87 */
88
89 #define NLMSG_ALIGNTO 4U
90 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
91 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
92 #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
93 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
94 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
95 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
96 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
97 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
98 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
99 (nlh)->nlmsg_len <= (len))
100 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
101
102 #define NLMSG_NOOP 0x1 /* Nothing. */
103 #define NLMSG_ERROR 0x2 /* Error */
104 #define NLMSG_DONE 0x3 /* End of a dump */
105 #define NLMSG_OVERRUN 0x4 /* Data lost */
106
107 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
108
109 struct nlmsgerr {
110 int error;
111 struct nlmsghdr msg;
112 /*
113 * followed by the message contents unless NETLINK_CAP_ACK was set
114 * or the ACK indicates success (error == 0)
115 * message length is aligned with NLMSG_ALIGN()
116 */
117 /*
118 * followed by TLVs defined in enum nlmsgerr_attrs
119 * if NETLINK_EXT_ACK was set
120 */
121 };
122
123 /**
124 * enum nlmsgerr_attrs - nlmsgerr attributes
125 * @NLMSGERR_ATTR_UNUSED: unused
126 * @NLMSGERR_ATTR_MSG: error message string (string)
127 * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original
128 * message, counting from the beginning of the header (u32)
129 * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to
130 * be used - in the success case - to identify a created
131 * object or operation or similar (binary)
132 * @__NLMSGERR_ATTR_MAX: number of attributes
133 * @NLMSGERR_ATTR_MAX: highest attribute number
134 */
135 enum nlmsgerr_attrs {
136 NLMSGERR_ATTR_UNUSED,
137 NLMSGERR_ATTR_MSG,
138 NLMSGERR_ATTR_OFFS,
139 NLMSGERR_ATTR_COOKIE,
140
141 __NLMSGERR_ATTR_MAX,
142 NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
143 };
144
145 #define NETLINK_ADD_MEMBERSHIP 1
146 #define NETLINK_DROP_MEMBERSHIP 2
147 #define NETLINK_PKTINFO 3
148 #define NETLINK_BROADCAST_ERROR 4
149 #define NETLINK_NO_ENOBUFS 5
150 #ifndef __KERNEL__
151 #define NETLINK_RX_RING 6
152 #define NETLINK_TX_RING 7
153 #endif
154 #define NETLINK_LISTEN_ALL_NSID 8
155 #define NETLINK_LIST_MEMBERSHIPS 9
156 #define NETLINK_CAP_ACK 10
157 #define NETLINK_EXT_ACK 11
158 #define NETLINK_GET_STRICT_CHK 12
159
160 struct nl_pktinfo {
161 __u32 group;
162 };
163
164 struct nl_mmap_req {
165 unsigned int nm_block_size;
166 unsigned int nm_block_nr;
167 unsigned int nm_frame_size;
168 unsigned int nm_frame_nr;
169 };
170
171 struct nl_mmap_hdr {
172 unsigned int nm_status;
173 unsigned int nm_len;
174 __u32 nm_group;
175 /* credentials */
176 __u32 nm_pid;
177 __u32 nm_uid;
178 __u32 nm_gid;
179 };
180
181 #ifndef __KERNEL__
182 enum nl_mmap_status {
183 NL_MMAP_STATUS_UNUSED,
184 NL_MMAP_STATUS_RESERVED,
185 NL_MMAP_STATUS_VALID,
186 NL_MMAP_STATUS_COPY,
187 NL_MMAP_STATUS_SKIP,
188 };
189
190 #define NL_MMAP_MSG_ALIGNMENT NLMSG_ALIGNTO
191 #define NL_MMAP_MSG_ALIGN(sz) __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
192 #define NL_MMAP_HDRLEN NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
193 #endif
194
195 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
196
197 enum {
198 NETLINK_UNCONNECTED = 0,
199 NETLINK_CONNECTED,
200 };
201
202 /*
203 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
204 * +---------------------+- - -+- - - - - - - - - -+- - -+
205 * | Header | Pad | Payload | Pad |
206 * | (struct nlattr) | ing | | ing |
207 * +---------------------+- - -+- - - - - - - - - -+- - -+
208 * <-------------- nlattr->nla_len -------------->
209 */
210
211 struct nlattr {
212 __u16 nla_len;
213 __u16 nla_type;
214 };
215
216 /*
217 * nla_type (16 bits)
218 * +---+---+-------------------------------+
219 * | N | O | Attribute Type |
220 * +---+---+-------------------------------+
221 * N := Carries nested attributes
222 * O := Payload stored in network byte order
223 *
224 * Note: The N and O flag are mutually exclusive.
225 */
226 #define NLA_F_NESTED (1 << 15)
227 #define NLA_F_NET_BYTEORDER (1 << 14)
228 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
229
230 #define NLA_ALIGNTO 4
231 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
232 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
233
234 /* Generic 32 bitflags attribute content sent to the kernel.
235 *
236 * The value is a bitmap that defines the values being set
237 * The selector is a bitmask that defines which value is legit
238 *
239 * Examples:
240 * value = 0x0, and selector = 0x1
241 * implies we are selecting bit 1 and we want to set its value to 0.
242 *
243 * value = 0x2, and selector = 0x2
244 * implies we are selecting bit 2 and we want to set its value to 1.
245 *
246 */
247 struct nla_bitfield32 {
248 __u32 value;
249 __u32 selector;
250 };
251
252 #endif /* _UAPI__LINUX_NETLINK_H */