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/*
* 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
#define NLM_F_ROOT 0x100
#define NLM_F_MATCH 0x200
#define NLM_F_EXCL 0x200
#define NLM_F_ATOMIC 0x400
#define NLM_F_CREATE 0x400
#define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
/* 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
/* 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
/* 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 */
#endif /* netlink-protocol.h */
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