1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* Copyright (c) 2008, 2010, 2011, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef NETLINK_PROTOCOL_H
#define NETLINK_PROTOCOL_H 1
/* Netlink protocol definitions.
*
* Netlink is a message framing format described in RFC 3549 and used heavily
* in Linux to access the network stack. Open vSwitch uses AF_NETLINK sockets
* for this purpose on Linux. But on all platforms, Open vSwitch uses Netlink
* message framing internally for certain purposes.
*
* This header provides access to the Netlink message framing definitions
* regardless of platform. On Linux, it includes the proper headers directly;
* on other platforms it directly defines the structures and macros itself.
*/
#include <stdint.h>
#include <sys/socket.h>
#include "util.h"
#ifdef HAVE_NETLINK
#include <linux/netlink.h>
#include <linux/genetlink.h>
#else
#define NETLINK_NETFILTER 12
#define NETLINK_GENERIC 16
/* nlmsg_flags bits. */
#define NLM_F_REQUEST 0x001
#define NLM_F_MULTI 0x002
#define NLM_F_ACK 0x004
#define NLM_F_ECHO 0x008
/* GET request flag.*/
#define NLM_F_ROOT 0x100
#define NLM_F_MATCH 0x200
#define NLM_F_ATOMIC 0x400
#define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
/* NEW request flags. */
#define NLM_F_REPLACE 0x100
#define NLM_F_EXCL 0x200
#define NLM_F_CREATE 0x400
/* nlmsg_type values. */
#define NLMSG_NOOP 1
#define NLMSG_ERROR 2
#define NLMSG_DONE 3
#define NLMSG_OVERRUN 4
#define NLMSG_MIN_TYPE 0x10
#define MAX_LINKS 32
struct nlmsghdr {
uint32_t nlmsg_len;
uint16_t nlmsg_type;
uint16_t nlmsg_flags;
uint32_t nlmsg_seq;
uint32_t nlmsg_pid;
};
BUILD_ASSERT_DECL(sizeof(struct nlmsghdr) == 16);
#define NLMSG_ALIGNTO 4
#define NLMSG_ALIGN(SIZE) ROUND_UP(SIZE, NLMSG_ALIGNTO)
#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
struct nlmsgerr
{
int error;
struct nlmsghdr msg;
};
BUILD_ASSERT_DECL(sizeof(struct nlmsgerr) == 20);
struct genlmsghdr {
uint8_t cmd;
uint8_t version;
uint16_t reserved;
};
BUILD_ASSERT_DECL(sizeof(struct genlmsghdr) == 4);
#define GENL_HDRLEN NLMSG_ALIGN(sizeof(struct genlmsghdr))
struct nlattr {
uint16_t nla_len;
uint16_t nla_type;
};
BUILD_ASSERT_DECL(sizeof(struct nlattr) == 4);
#define NLA_ALIGNTO 4
#define NLA_ALIGN(SIZE) ROUND_UP(SIZE, NLA_ALIGNTO)
#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
#define GENL_MIN_ID NLMSG_MIN_TYPE
#define GENL_MAX_ID 1023
#define GENL_ID_CTRL NLMSG_MIN_TYPE
enum {
CTRL_CMD_UNSPEC,
CTRL_CMD_NEWFAMILY,
CTRL_CMD_DELFAMILY,
CTRL_CMD_GETFAMILY,
CTRL_CMD_NEWOPS,
CTRL_CMD_DELOPS,
CTRL_CMD_GETOPS,
__CTRL_CMD_MAX,
};
#define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
enum {
CTRL_ATTR_UNSPEC,
CTRL_ATTR_FAMILY_ID,
CTRL_ATTR_FAMILY_NAME,
CTRL_ATTR_VERSION,
CTRL_ATTR_HDRSIZE,
CTRL_ATTR_MAXATTR,
CTRL_ATTR_OPS,
__CTRL_ATTR_MAX,
};
#define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
enum {
CTRL_ATTR_OP_UNSPEC,
CTRL_ATTR_OP_ID,
CTRL_ATTR_OP_FLAGS,
__CTRL_ATTR_OP_MAX,
};
#define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
#endif /* !HAVE_NETLINK */
/* These were introduced all together in 2.6.24. */
#ifndef NLA_TYPE_MASK
#define NLA_F_NESTED (1 << 15)
#define NLA_F_NET_BYTEORDER (1 << 14)
#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
#endif
/* Introduced in v4.4. */
#ifndef NLM_F_DUMP_FILTERED
#define NLM_F_DUMP_FILTERED 0x20
#endif
/* These were introduced all together in 2.6.14. (We want our programs to
* support the newer kernel features even if compiled with older headers.) */
#ifndef NETLINK_ADD_MEMBERSHIP
#define NETLINK_ADD_MEMBERSHIP 1
#define NETLINK_DROP_MEMBERSHIP 2
#endif
/* This was introduced in v4.2. (We want our programs to support the newer
* kernel features even if compiled with older headers.) */
#ifndef NETLINK_LISTEN_ALL_NSID
#define NETLINK_LISTEN_ALL_NSID 8
#endif
/* Strict checking of netlink arguments introduced in Linux kernel v4.20. */
#ifndef NETLINK_GET_STRICT_CHK
#define NETLINK_GET_STRICT_CHK 12
#endif
/* These were introduced all together in 2.6.23. (We want our programs to
* support the newer kernel features even if compiled with older headers.) */
#ifndef CTRL_ATTR_MCAST_GRP_MAX
#undef CTRL_ATTR_MAX
#define CTRL_ATTR_MAX 7
#define CTRL_ATTR_MCAST_GROUPS 7
enum {
CTRL_ATTR_MCAST_GRP_UNSPEC,
CTRL_ATTR_MCAST_GRP_NAME,
CTRL_ATTR_MCAST_GRP_ID,
__CTRL_ATTR_MCAST_GRP_MAX,
};
#define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)
#endif /* CTRL_ATTR_MCAST_GRP_MAX */
#ifndef NETLINK_EXT_ACK
#define NETLINK_CAP_ACK 10
#define NETLINK_EXT_ACK 11
/* ACK message flags. */
#define NLM_F_CAPPED 0x100
#define NLM_F_ACK_TLVS 0x200
enum {
NLMSGERR_ATTR_UNUSED,
NLMSGERR_ATTR_MSG,
NLMSGERR_ATTR_OFFS,
__NLMSGERR_ATTR_MAX,
NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
};
#endif /* NLM_F_ACK_TLVS */
#endif /* netlink-protocol.h */
|
