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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_PROTO_H_
#define __NETLINK_PROTO_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. On Windows platform too, Open vSwitch uses
* netlink message format for userspace-kernelspace communication.
*
* This header provides access to the Netlink message framing definitions
* regardless of platform.
*/
#include "Types.h"
#define BUILD_ASSERT(EXPR) \
typedef char AssertOnCompileFailed[(EXPR) ? 1: -1]
#define BUILD_ASSERT_DECL(EXPR) BUILD_ASSERT(EXPR)
/* Returns X / Y, rounding up. X must be nonnegative to round correctly. */
#define DIV_ROUND_UP(X, Y) (((X) + ((Y) - 1)) / (Y))
/* Returns X rounded up to the nearest multiple of Y. */
#define ROUND_UP(X, Y) (DIV_ROUND_UP(X, Y) * (Y))
/* Returns the least number that, when added to X, yields a multiple of Y. */
#define PAD_SIZE(X, Y) (ROUND_UP(X, Y) - (X))
/* Netlink message */
/* 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
#define NLMSG_ALIGNTO 4
#define NLMSG_ALIGN(SIZE) ROUND_UP(SIZE, NLMSG_ALIGNTO)
#define NLA_ALIGNTO 4
#define NLA_ALIGN(SIZE) ROUND_UP(SIZE, NLA_ALIGNTO)
typedef struct ovs_header OVS_HDR, *POVS_HDR;
typedef struct _NL_MSG_HDR {
UINT32 nlmsgLen;
UINT16 nlmsgType;
UINT16 nlmsgFlags;
UINT32 nlmsgSeq;
UINT32 nlmsgPid;
} NL_MSG_HDR, *PNL_MSG_HDR;
BUILD_ASSERT_DECL(sizeof(NL_MSG_HDR) == 16);
typedef struct _NlMsgErr
{
INT error;
NL_MSG_HDR nlMsg;
} NL_MSG_ERR, *PNL_MSG_ERR;
BUILD_ASSERT_DECL(sizeof(NL_MSG_ERR) == 20);
typedef struct _GENL_MSG_HDR {
UINT8 cmd;
UINT8 version;
UINT16 reserved;
} GENL_MSG_HDR, *PGENL_MSG_HDR;
BUILD_ASSERT_DECL(sizeof(GENL_MSG_HDR) == 4);
/* Netlink attributes */
typedef struct _NL_ATTR {
UINT16 nlaLen;
UINT16 nlaType;
} NL_ATTR, *PNL_ATTR;
BUILD_ASSERT_DECL(sizeof(NL_ATTR) == 4);
#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
#define NLMSG_HDRLEN ((INT) NLMSG_ALIGN(sizeof(NL_MSG_HDR)))
#define GENL_HDRLEN NLMSG_ALIGN(sizeof(GENL_MSG_HDR))
#define OVS_HDRLEN NLMSG_ALIGN(sizeof(OVS_HDR))
#define NLA_HDRLEN ((INT) NLA_ALIGN(sizeof(NL_ATTR)))
#endif /* NetlinProto.h */
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