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gnrc_netif: add fetch-address and fetch-netif-flag functionalities.

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This commit is contained in:
zhuoshuguo 2016-11-07 18:18:19 +01:00
parent e6ad438a0b
commit d749962134
2 changed files with 89 additions and 0 deletions
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31
sys/include/net/gnrc/netif/hdr.h
View File

@ -199,6 +199,37 @@ gnrc_pktsnip_t *gnrc_netif_hdr_build(uint8_t *src, uint8_t src_len, uint8_t *dst
*/
void gnrc_netif_hdr_print(gnrc_netif_hdr_t *hdr);
/* @brief Fetch the netif header flags of a gnrc packet
*
* @param[in] pkt gnrc packet from whom to fetch
*
* @return netif header flags of @p pkt
* @return 0, if no header is present
*/
uint8_t gnrc_netif_hdr_get_flag(gnrc_pktsnip_t* pkt);
/* @brief Extract the destination address out of a gnrc packet
*
* @param[in] pkt gnrc packet from whom to extract
* @param[out] pointer_to_addr pointer to address will be stored here
*
* @return length of destination address
* @return -ENOENT, if no netif header is presented in @p pkt or if no
* destination address field presented in netif header.
*/
int gnrc_netif_hdr_get_dstaddr(gnrc_pktsnip_t* pkt, uint8_t** pointer_to_addr);
/* @brief Extract the source address out of a gnrc packet
*
* @param[in] pkt gnrc packet from whom to extract
* @param[out] pointer_to_addr pointer to address will be stored here
*
* @return length of source address
* @return -ENOENT, if no netif header is presented in @p pkt or if no
* source address field presented in netif header.
*/
int gnrc_netif_hdr_get_srcaddr(gnrc_pktsnip_t* pkt, uint8_t** pointer_to_addr);
#ifdef __cplusplus
}
#endif

58
sys/net/gnrc/netif/hdr/gnrc_netif_hdr.c
View File

@ -38,4 +38,62 @@ gnrc_pktsnip_t *gnrc_netif_hdr_build(uint8_t *src, uint8_t src_len, uint8_t *dst
return pkt;
}
uint8_t gnrc_netif_hdr_get_flag(gnrc_pktsnip_t* pkt)
{
gnrc_netif_hdr_t* netif_hdr;
assert(pkt != NULL);
pkt = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_NETIF);
if (pkt) {
netif_hdr = pkt->data;
if (netif_hdr) {
return netif_hdr->flags;
}
}
return 0U;
}
int gnrc_netif_hdr_get_dstaddr(gnrc_pktsnip_t* pkt, uint8_t** pointer_to_addr)
{
int res;
gnrc_netif_hdr_t* netif_hdr;
assert(pkt != NULL);
pkt = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_NETIF);
if (pkt) {
netif_hdr = pkt->data;
if (netif_hdr) {
if ((res = netif_hdr->dst_l2addr_len) <= 0) {
return -ENOENT;
}
*pointer_to_addr = gnrc_netif_hdr_get_dst_addr(netif_hdr);
return res;
}
}
return -ENOENT;
}
int gnrc_netif_hdr_get_srcaddr(gnrc_pktsnip_t* pkt, uint8_t** pointer_to_addr)
{
int res;
gnrc_netif_hdr_t* netif_hdr;
assert(pkt != NULL);
pkt = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_NETIF);
if (pkt) {
netif_hdr = pkt->data;
if (netif_hdr) {
if ((res = netif_hdr->src_l2addr_len) <= 0) {
return -ENOENT;
}
*pointer_to_addr = gnrc_netif_hdr_get_src_addr(netif_hdr);
return res;
}
}
return -ENOENT;
}
/** @} */