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drivers: ieee802154: b91: buflen sanity check

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Introduces a (currently redundant) buffer length sanity check to prepare
for L2s that support PHYs with PHY payloads > 127 bytes.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
This commit is contained in:
Florian Grandel 2023-10-17 09:33:38 +02:00 committed by Johan Hedberg
parent 0ec6f18434
commit 0269170420
1 changed files with 17 additions and 4 deletions
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21
drivers/ieee802154/ieee802154_b91.c
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@ -173,19 +173,26 @@ static void b91_update_rssi_and_lqi(struct net_pkt *pkt)
}
/* Prepare TX buffer */
static void b91_set_tx_payload(uint8_t *payload, uint8_t payload_len)
static int b91_set_tx_payload(uint8_t *payload, uint8_t payload_len)
{
unsigned char rf_data_len;
unsigned int rf_tx_dma_len;
/* See Telink SDK Dev Handbook, AN-21010600, section 21.5.2.2. */
if (payload_len > (B91_TRX_LENGTH - B91_PAYLOAD_OFFSET - IEEE802154_FCS_LENGTH)) {
return -EINVAL;
}
rf_data_len = payload_len + 1;
rf_tx_dma_len = rf_tx_packet_dma_len(rf_data_len);
data.tx_buffer[0] = rf_tx_dma_len & 0xff;
data.tx_buffer[1] = (rf_tx_dma_len >> 8) & 0xff;
data.tx_buffer[2] = (rf_tx_dma_len >> 16) & 0xff;
data.tx_buffer[3] = (rf_tx_dma_len >> 24) & 0xff;
data.tx_buffer[4] = payload_len + 2;
data.tx_buffer[4] = payload_len + IEEE802154_FCS_LENGTH;
memcpy(data.tx_buffer + B91_PAYLOAD_OFFSET, payload, payload_len);
return 0;
}
/* Enable ack handler */
@ -243,7 +250,10 @@ static void b91_send_ack(uint8_t seq_num)
{
uint8_t ack_buf[] = { B91_ACK_TYPE, 0, seq_num };
b91_set_tx_payload(ack_buf, sizeof(ack_buf));
if (b91_set_tx_payload(ack_buf, sizeof(ack_buf))) {
return;
}
rf_set_txmode();
delay_us(CONFIG_IEEE802154_B91_SET_TXRX_DELAY_US);
rf_tx_pkt(data.tx_buffer);
@ -534,7 +544,10 @@ static int b91_tx(const struct device *dev,
}
/* prepare tx buffer */
b91_set_tx_payload(frag->data, frag->len);
status = b91_set_tx_payload(frag->data, frag->len);
if (status) {
return status;
}
/* reset semaphores */
k_sem_reset(&b91->tx_wait);