2 * Copyright (c) 2008, 2010 Nicira Networks.
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.
33 #include <sys/socket.h>
37 #include <linux/netlink.h>
38 #include <linux/genetlink.h>
40 #define NETLINK_GENERIC 16
43 sa_family_t nl_family;
44 unsigned short int nl_pad;
48 BUILD_ASSERT_DECL(sizeof(struct sockaddr_nl) == 12);
50 /* nlmsg_flags bits. */
51 #define NLM_F_REQUEST 0x001
52 #define NLM_F_MULTI 0x002
53 #define NLM_F_ACK 0x004
54 #define NLM_F_ECHO 0x008
56 #define NLM_F_ROOT 0x100
57 #define NLM_F_MATCH 0x200
58 #define NLM_F_ATOMIC 0x400
59 #define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
61 /* nlmsg_type values. */
65 #define NLMSG_OVERRUN 4
67 #define NLMSG_MIN_TYPE 0x10
76 BUILD_ASSERT_DECL(sizeof(struct nlmsghdr) == 16);
78 #define NLMSG_ALIGNTO 4
79 #define NLMSG_ALIGN(SIZE) ROUND_UP(SIZE, NLMSG_ALIGNTO)
80 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
87 BUILD_ASSERT_DECL(sizeof(struct nlmsgerr) == 20);
89 #define NETLINK_ADD_MEMBERSHIP 1
90 #define NETLINK_DROP_MEMBERSHIP 2
91 #define NETLINK_PKTINFO 3
98 BUILD_ASSERT_DECL(sizeof(struct genlmsghdr) == 4);
100 #define GENL_HDRLEN NLMSG_ALIGN(sizeof(struct genlmsghdr))
106 BUILD_ASSERT_DECL(sizeof(struct nlattr) == 4);
108 #define NLA_ALIGNTO 4
109 #define NLA_ALIGN(SIZE) ROUND_UP(SIZE, NLA_ALIGNTO)
110 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
112 #define GENL_MIN_ID NLMSG_MIN_TYPE
113 #define GENL_MAX_ID 1023
115 #define GENL_ID_CTRL NLMSG_MIN_TYPE
128 #define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
133 CTRL_ATTR_FAMILY_NAME,
141 #define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
150 #define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
151 #endif /* !HAVE_NETLINK */
153 /* These were introduced all together in 2.6.24. */
154 #ifndef NLA_TYPE_MASK
155 #define NLA_F_NESTED (1 << 15)
156 #define NLA_F_NET_BYTEORDER (1 << 14)
157 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
160 #endif /* netlink-protocol.h */