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xbee: add packet filtering to emulate non-transitive network.

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When debugging multihop wireless network, it is useful to emulate non-transitive
network, that is, node A can communicate with B and B can communicate with C,
but A cannot communicate with C directly.

If `XBEE_DENIED_ADDRESSES`, which is an array of XBee long addresses, is
defined, packets from those addresses are dropped silently.

Example:
CFLAGS += "-DXBEE_DENIED_ADDRESSES={ 0x02, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0x02, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11 }"
This commit is contained in:
Yonezawa-T2 2015-12-08 19:37:40 +09:00
parent a6ae7c8091
commit 15ecee46ee
1 changed files with 17 additions and 0 deletions
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17
drivers/xbee/xbee.c
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@ -731,6 +731,23 @@ static void _isr_event(gnrc_netdev_t *netdev, uint32_t event_type)
addr_len = IEEE802154_LONG_ADDRESS_LEN;
}
#ifdef XBEE_DENIED_ADDRESSES
if (addr_len == 8) {
uint8_t denied_addresses[] = XBEE_DENIED_ADDRESSES;
for (size_t i = 0; i < sizeof(denied_addresses) / 8; i++) {
if (memcmp(&(dev->rx_buf[1]),
&denied_addresses[i * 8],
addr_len) == 0) {
dev->rx_count = 0;
DEBUG("xbee: dropping denied packet\n");
return;
}
}
}
#endif
/* check checksum for correctness */
for (int i = 0; i < dev->rx_limit; i++) {
cksum += dev->rx_buf[i];