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platform/netlink: add nla_data_as() macro

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This macro casts the return pointer and asserts that the netlink attribute
is suitably large.
This commit is contained in:
Thomas Haller 2019-02-18 12:09:49 +01:00
parent 5920f187d3
commit 020000433b
1 changed files with 14 additions and 0 deletions
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14
src/platform/nm-netlink.h
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@ -154,6 +154,20 @@ nla_data (const struct nlattr *nla)
return &(((char *) nla)[NLA_HDRLEN]);
}
#define nla_data_as(type, nla) \
({ \
const struct nlattr *_nla = (nla); \
\
nm_assert (nla_len (_nla) >= sizeof (type)); \
\
/* note that casting the pointer is undefined behavior in C, if
* the data has wrong alignment. Netlink data is aligned to 4 bytes,
* that means, if the alignment is larger than 4, this is invalid. */ \
G_STATIC_ASSERT_EXPR (_nm_alignof (type) <= NLA_ALIGNTO); \
\
(type *) nla_data (_nla); \
})
static inline uint8_t
nla_get_u8 (const struct nlattr *nla)
{