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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 __OVS_NETLINK_H_
#define __OVS_NETLINK_H_ 1
#include "lib/netlink-protocol.h"
/* 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))
static __inline int
nl_attr_is_valid(const struct nlattr *nla, size_t maxlen)
{
return (maxlen >= sizeof *nla
&& nla->nla_len >= sizeof *nla
&& nla->nla_len <= maxlen);
}
static __inline size_t
nl_attr_len_pad(const struct nlattr *nla, size_t maxlen)
{
size_t len = NLA_ALIGN(nla->nla_len);
return len <= maxlen ? len : nla->nla_len;
}
/* 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); \
nl_attr_is_valid(ITER, LEFT); \
(LEFT) -= nl_attr_len_pad(ITER, LEFT), (ITER) = nl_attr_next(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)->nla_len), (ITER) = nl_attr_next(ITER))
/* 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
/* Netlink attribute iteration. */
static __inline struct nlattr *
nl_attr_next(const struct nlattr *nla)
{
return (struct nlattr *) ((uint8_t *) nla + NLA_ALIGN(nla->nla_len));
}
/* Returns the bits of 'nla->nla_type' that are significant for determining
* its type. */
static __inline int
nl_attr_type(const struct nlattr *nla)
{
return nla->nla_type & NLA_TYPE_MASK;
}
static __inline void *
nl_attr_data(const struct nlattr *nla)
{
return ((char *)nla + NLA_HDRLEN);
}
/* Returns the number of bytes in the payload of attribute 'nla'. */
static __inline uint32_t
nl_attr_get_size(const struct nlattr *nla)
{
return nla->nla_len - NLA_HDRLEN;
}
/* Returns the first byte in the payload of attribute 'nla'. */
static __inline const void *
nl_attr_get(const struct nlattr *nla)
{
ASSERT(nla->nla_len >= NLA_HDRLEN);
return nla + 1;
}
#define NL_ATTR_GET_AS(NLA, TYPE) \
(*(TYPE*) nl_attr_get_unspec(nla, sizeof(TYPE)))
/* Asserts that 'nla''s payload is at least 'size' bytes long, and returns the
* first byte of the payload. */
static const void *
nl_attr_get_unspec(const struct nlattr *nla, size_t size)
{
DBG_UNREFERENCED_PARAMETER(size);
ASSERT(nla->nla_len >= NLA_HDRLEN + size);
return nla + 1;
}
/* Returns the 64-bit network byte order value in 'nla''s payload.
*
* Asserts that 'nla''s payload is at least 8 bytes long. */
static __inline __be64
nl_attr_get_be64(const struct nlattr *nla)
{
return NL_ATTR_GET_AS(nla, __be64);
}
/* Returns the 32-bit network byte order value in 'nla''s payload.
*
* Asserts that 'nla''s payload is at least 4 bytes long. */
static __inline __be32
nl_attr_get_be32(const struct nlattr *nla)
{
return NL_ATTR_GET_AS(nla, __be32);
}
/* Returns the 8-bit value in 'nla''s payload. */
static __inline uint8_t
nl_attr_get_u8(const struct nlattr *nla)
{
return NL_ATTR_GET_AS(nla, uint8_t);
}
/* Returns the 32-bit host byte order value in 'nla''s payload.
*
* Asserts that 'nla''s payload is at least 4 bytes long. */
static __inline uint32_t
nl_attr_get_u32(const struct nlattr *nla)
{
return NL_ATTR_GET_AS(nla, uint32_t);
}
static __inline const struct nlattr *
nl_attr_find__(const struct nlattr *attrs, size_t size, uint16_t type)
{
const struct nlattr *nla;
size_t left;
NL_ATTR_FOR_EACH (nla, left, attrs, size) {
if (nl_attr_type(nla) == type) {
return nla;
}
}
return NULL;
}
/* Returns the first Netlink attribute within 'nla' with the specified
* 'type'.
*
* This function does not validate the attribute's length. */
static __inline const struct nlattr *
nl_attr_find_nested(const struct nlattr *nla, uint16_t type)
{
return nl_attr_find__(nl_attr_get(nla), nl_attr_get_size(nla), type);
}
#endif /* __OVS_NETLINK_H_ */
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