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sixlowpan: more helper functions

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This commit is contained in:
Martine Lenders 2019-10-13 16:46:30 +02:00
parent e236fa1ef3
commit a7d082d9b8
1 changed files with 69 additions and 5 deletions
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74
sys/include/net/sixlowpan.h
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@ -146,7 +146,33 @@ typedef struct __attribute__((packed)) {
} sixlowpan_frag_n_t;
/**
* @brief Checks if a given fragment is a 6LoWPAN fragment.
* @brief Checks if a given header is a 1st 6LoWPAN fragment header
*
* @param[in] hdr A 6LoWPAN fragmentation header.
*
* @return true, if given fragment is a 1st 6LoWPAN fragment.
* @return false, if given fragment is not a 1st 6LoWPAN fragment.
*/
static inline bool sixlowpan_frag_1_is(sixlowpan_frag_t *hdr)
{
return ((hdr->disp_size.u8[0] & SIXLOWPAN_FRAG_DISP_MASK) == SIXLOWPAN_FRAG_1_DISP);
}
/**
* @brief Checks if a given header is a subsequent 6LoWPAN fragment header
*
* @param[in] hdr A 6LoWPAN fragmentation header.
*
* @return true, if given fragment is a subsequent 6LoWPAN fragment.
* @return false, if given fragment is not a subsequent 6LoWPAN fragment.
*/
static inline bool sixlowpan_frag_n_is(sixlowpan_frag_t *hdr)
{
return ((hdr->disp_size.u8[0] & SIXLOWPAN_FRAG_DISP_MASK) == SIXLOWPAN_FRAG_N_DISP);
}
/**
* @brief Checks if a given header is a 6LoWPAN fragment header.
*
* @param[in] hdr A 6LoWPAN fragmentation header.
*
@ -155,10 +181,48 @@ typedef struct __attribute__((packed)) {
*/
static inline bool sixlowpan_frag_is(sixlowpan_frag_t *hdr)
{
return ((hdr->disp_size.u8[0] & SIXLOWPAN_FRAG_DISP_MASK) ==
SIXLOWPAN_FRAG_1_DISP) ||
((hdr->disp_size.u8[0] & SIXLOWPAN_FRAG_DISP_MASK) ==
SIXLOWPAN_FRAG_N_DISP);
return sixlowpan_frag_1_is(hdr) || sixlowpan_frag_n_is(hdr);
}
/**
* @brief Get datagram size from general 6LoWPAN fragment header
*
* @param[in] hdr A general 6LoWPAN fragment header.
*
* @return The datagram size for the 6LoWPAN fragment.
*/
static inline uint16_t sixlowpan_frag_datagram_size(sixlowpan_frag_t *hdr)
{
return (byteorder_ntohs(hdr->disp_size) & SIXLOWPAN_FRAG_SIZE_MASK);
}
/**
* @brief Get datagram tag from general 6LoWPAN fragment header
*
* @param[in] hdr A general 6LoWPAN fragment header.
*
* @return The datagram tag for the 6LoWPAN fragment.
*/
static inline uint16_t sixlowpan_frag_datagram_tag(sixlowpan_frag_t *hdr)
{
return byteorder_ntohs(hdr->tag);
}
/**
* @brief Get fragment offset from a subsequent 6LoWPAN fragment header
*
* @param[in] hdr A subsequent 6LoWPAN fragment header.
*
* @return The offset of the 6LoWPAN fragment.
*/
static inline uint16_t sixlowpan_frag_offset(sixlowpan_frag_n_t *hdr)
{
/* https://tools.ietf.org/html/rfc4944#section-5.3:
* datagram_offset: This field is present only in the second and
* subsequent link fragments and SHALL specify the offset, in
* increments of 8 octets, of the fragment from the beginning of the
* payload datagram. [...] */
return (hdr->offset * 8U);
}
/** @} */