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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2013, 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_H_
#define __NETLINK_H_ 1
#include "Types.h"
#include "NetlinkProto.h"
/* Netlink attribute types. */
typedef enum
{
NL_A_NO_ATTR = 0,
NL_A_UNSPEC,
NL_A_U8,
NL_A_U16,
NL_A_BE16 = NL_A_U16,
NL_A_U32,
NL_A_BE32 = NL_A_U32,
NL_A_U64,
NL_A_BE64 = NL_A_U64,
NL_A_STRING,
NL_A_FLAG,
NL_A_NESTED,
N_NL_ATTR_TYPES
} NL_ATTR_TYPE;
/* Netlink attribute policy.
* Specifies the policy for parsing for netlink attribute. */
typedef struct _NL_POLICY
{
NL_ATTR_TYPE type;
UINT32 minLen;
UINT32 maxLen;
} NL_POLICY, *PNL_POLICY;
/* This macro is careful to check for attributes with bad lengths. */
#define NL_ATTR_FOR_EACH(ITER, LEFT, ATTRS, ATTRS_LEN) \
for ((ITER) = (ATTRS), (LEFT) = (ATTRS_LEN); \
NlAttrIsValid(ITER, LEFT); \
(LEFT) -= NlAttrLenPad(ITER, LEFT), (ITER) = NlAttrNext(ITER))
/* This macro does not check for attributes with bad lengths. It should only
* be used with messages from trusted sources or with messages that have
* already been validated (e.g. with NL_ATTR_FOR_EACH). */
#define NL_ATTR_FOR_EACH_UNSAFE(ITER, LEFT, ATTRS, ATTRS_LEN) \
for ((ITER) = (ATTRS), (LEFT) = (ATTRS_LEN); \
(LEFT) > 0; \
(LEFT) -= NLA_ALIGN((ITER)->nlaLen), (ITER) = NlAttrNext(ITER))
#define NL_ATTR_GET_AS(NLA, TYPE) \
(*(TYPE*) NlAttrGetUnspec(nla, sizeof(TYPE)))
/* Netlink message accessing the payload */
PVOID NlMsgAt(const PNL_MSG_HDR nlh, UINT32 offset);
UINT32 NlMsgSize(const PNL_MSG_HDR nlh);
PCHAR NlMsgPayload(const PNL_MSG_HDR nlh);
UINT32 NlMsgPayloadLen(const PNL_MSG_HDR nlh);
PNL_ATTR NlMsgAttrs(const PNL_MSG_HDR nlh);
INT NlMsgAttrLen(const PNL_MSG_HDR nlh);
/* Netlink message parse */
PNL_MSG_HDR NlMsgNext(const PNL_MSG_HDR nlh);
INT NlAttrIsValid(const PNL_ATTR nla, UINT32 maxlen);
UINT32 NlAttrLenPad(const PNL_ATTR nla, UINT32 maxlen);
/* Netlink attribute parsing. */
UINT32 NlAttrMinLen(NL_ATTR_TYPE type);
UINT32 NlAttrMinLen(NL_ATTR_TYPE type);
PNL_ATTR NlAttrNext(const PNL_ATTR nla);
UINT16 NlAttrType(const PNL_ATTR nla);
PVOID NlAttrData(const PNL_ATTR nla);
UINT32 NlAttrGetSize(const PNL_ATTR nla);
const PVOID NlAttrGet(const PNL_ATTR nla);
const PVOID NlAttrGetUnspec(const PNL_ATTR nla, UINT32 size);
BE64 NlAttrGetBe64(const PNL_ATTR nla);
BE32 NlAttrGetBe32(const PNL_ATTR nla);
UINT8 NlAttrGetU8(const PNL_ATTR nla);
UINT32 NlAttrGetU32(const PNL_ATTR nla);
const PNL_ATTR NlAttrFind__(const PNL_ATTR attrs,
UINT32 size, UINT16 type);
const PNL_ATTR NlAttrFindNested(const PNL_ATTR nla,
UINT16 type);
BOOLEAN NlAttrParse(const PNL_MSG_HDR nlMsg, UINT32 attrOffset,
const NL_POLICY policy[],
PNL_ATTR attrs[], UINT32 n_attrs);
/* Netlink attribute validation */
BOOLEAN NlAttrValidate(const PNL_ATTR, const PNL_POLICY);
#endif /* __NETLINK_H_ */
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