struct net_buf *
ieee802154_create_mac_cmd_frame(struct net_if *iface,
enum ieee802154_cfi type,
struct ieee802154_frame_params *params)
{
struct ieee802154_context *ctx = net_if_l2_data(iface);
struct ieee802154_fcf_seq *fs;
struct net_buf *buf, *frag;
uint8_t *p_buf;
buf = net_nbuf_get_reserve_tx(0);
if (!buf) {
return NULL;
}
frag = net_nbuf_get_reserve_data(0);
if (!frag) {
goto error;
}
net_buf_frag_add(buf, frag);
p_buf = net_nbuf_ll(buf);
fs = generate_fcf_grounds(&p_buf, false);
fs->fc.frame_type = IEEE802154_FRAME_TYPE_MAC_COMMAND;
fs->sequence = ctx->sequence;
if (!cfi_to_fs_settings(type, fs, params)) {
goto error;
}
p_buf = generate_addressing_fields(iface, fs, params, p_buf);
/* Let's insert the cfi */
((struct ieee802154_command *)p_buf)->cfi = type;
/* In MAC command, we consider ll header being the mhr.
* Rest will be the MAC command itself. This will proove
* to be easy to handle afterwards to point directly to MAC
* command space, in order to fill-in its content.
*/
net_nbuf_set_ll_reserve(buf, p_buf - net_nbuf_ll(buf));
net_buf_pull(frag, net_nbuf_ll_reserve(buf));
/* Thus setting the right MAC command length
* Now up to the caller to fill-in this space relevantly.
* See ieee802154_mac_command() helper.
*/
net_nbuf_set_len(frag, mac_command_length(type));
dbg_print_fs(fs);
return buf;
error:
net_nbuf_unref(buf);
return NULL;
}
struct net_pkt *
ieee802154_create_mac_cmd_frame(struct ieee802154_context *ctx,
enum ieee802154_cfi type,
struct ieee802154_frame_params *params)
{
struct ieee802154_fcf_seq *fs;
struct net_pkt *pkt;
struct net_buf *frag;
u8_t *p_buf;
pkt = net_pkt_get_reserve_tx(0, K_FOREVER);
if (!pkt) {
return NULL;
}
frag = net_pkt_get_frag(pkt, K_FOREVER);
if (!frag) {
goto error;
}
net_pkt_frag_add(pkt, frag);
p_buf = net_pkt_ll(pkt);
fs = generate_fcf_grounds(&p_buf,
type == IEEE802154_CFI_BEACON_REQUEST ?
false : ctx->ack_requested);
fs->fc.frame_type = IEEE802154_FRAME_TYPE_MAC_COMMAND;
fs->sequence = ctx->sequence;
if (!cfi_to_fs_settings(type, fs, params)) {
goto error;
}
p_buf = generate_addressing_fields(ctx, fs, params, p_buf);
/* Let's insert the cfi */
((struct ieee802154_command *)p_buf)->cfi = type;
/* In MAC command, we consider ll header being the mhr.
* Rest will be the MAC command itself. This will proove
* to be easy to handle afterwards to point directly to MAC
* command space, in order to fill-in its content.
*/
net_pkt_set_ll_reserve(pkt, p_buf - net_pkt_ll(pkt));
net_buf_pull(frag, net_pkt_ll_reserve(pkt));
/* Thus setting the right MAC command length
* Now up to the caller to fill-in this space relevantly.
* See ieee802154_mac_command() helper.
*/
frag->len = mac_command_length(type);
dbg_print_fs(fs);
return pkt;
error:
net_pkt_unref(pkt);
return NULL;
}
