2 * Copyright (c) 2008, 2010, 2011, 2014 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef NETLINK_PROTOCOL_H
18 #define NETLINK_PROTOCOL_H 1
20 /* Netlink protocol definitions.
22 * Netlink is a message framing format described in RFC 3549 and used heavily
23 * in Linux to access the network stack. Open vSwitch uses AF_NETLINK sockets
24 * for this purpose on Linux. But on all platforms, Open vSwitch uses Netlink
25 * message framing internally for certain purposes.
27 * This header provides access to the Netlink message framing definitions
28 * regardless of platform. On Linux, it includes the proper headers directly;
29 * on other platforms it directly defines the structures and macros itself.
32 /* This file is included by windows driver as well (as of now).
33 * It does not have access to following header files,
34 * hence do not include them for windows driver.
38 #include <sys/socket.h>
43 #include <linux/netlink.h>
44 #include <linux/genetlink.h>
47 #define NETLINK_GENERIC 16
49 /* nlmsg_flags bits. */
50 #define NLM_F_REQUEST 0x001
51 #define NLM_F_MULTI 0x002
52 #define NLM_F_ACK 0x004
53 #define NLM_F_ECHO 0x008
55 #define NLM_F_ROOT 0x100
56 #define NLM_F_MATCH 0x200
57 #define NLM_F_EXCL 0x200
58 #define NLM_F_ATOMIC 0x400
59 #define NLM_F_CREATE 0x400
60 #define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
62 /* nlmsg_type values. */
66 #define NLMSG_OVERRUN 4
68 #define NLMSG_MIN_TYPE 0x10
79 BUILD_ASSERT_DECL(sizeof(struct nlmsghdr) == 16);
81 #define NLMSG_ALIGNTO 4
82 #define NLMSG_ALIGN(SIZE) ROUND_UP(SIZE, NLMSG_ALIGNTO)
83 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
90 BUILD_ASSERT_DECL(sizeof(struct nlmsgerr) == 20);
97 BUILD_ASSERT_DECL(sizeof(struct genlmsghdr) == 4);
99 #define GENL_HDRLEN NLMSG_ALIGN(sizeof(struct genlmsghdr))
105 BUILD_ASSERT_DECL(sizeof(struct nlattr) == 4);
107 #define NLA_ALIGNTO 4
108 #define NLA_ALIGN(SIZE) ROUND_UP(SIZE, NLA_ALIGNTO)
109 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
111 #define GENL_MIN_ID NLMSG_MIN_TYPE
112 #define GENL_MAX_ID 1023
114 #define GENL_ID_CTRL NLMSG_MIN_TYPE
127 #define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
132 CTRL_ATTR_FAMILY_NAME,
140 #define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
149 #define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
150 #endif /* !HAVE_NETLINK */
152 /* These were introduced all together in 2.6.24. */
153 #ifndef NLA_TYPE_MASK
154 #define NLA_F_NESTED (1 << 15)
155 #define NLA_F_NET_BYTEORDER (1 << 14)
156 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
159 /* These were introduced all together in 2.6.14. (We want our programs to
160 * support the newer kernel features even if compiled with older headers.) */
161 #ifndef NETLINK_ADD_MEMBERSHIP
162 #define NETLINK_ADD_MEMBERSHIP 1
163 #define NETLINK_DROP_MEMBERSHIP 2
166 /* These were introduced all together in 2.6.23. (We want our programs to
167 * support the newer kernel features even if compiled with older headers.) */
168 #ifndef CTRL_ATTR_MCAST_GRP_MAX
171 #define CTRL_ATTR_MAX 7
172 #define CTRL_ATTR_MCAST_GROUPS 7
175 CTRL_ATTR_MCAST_GRP_UNSPEC,
176 CTRL_ATTR_MCAST_GRP_NAME,
177 CTRL_ATTR_MCAST_GRP_ID,
178 __CTRL_ATTR_MCAST_GRP_MAX,
181 #define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)
182 #endif /* CTRL_ATTR_MCAST_GRP_MAX */
184 #endif /* netlink-protocol.h */