Hi Luiz,
>> This uses a BPF filter to filter packets to specific index.
>> ---
>> monitor/control.c | 36 ++++++++++++++++++++++++++++++++++++
>> monitor/control.h | 1 +
>> monitor/packet.c | 9 ++-------
>> 3 files changed, 39 insertions(+), 7 deletions(-)
>>
>> diff --git a/monitor/control.c b/monitor/control.c
>> index 9bbdc37dc..05cfc3aaa 100644
>> --- a/monitor/control.c
>> +++ b/monitor/control.c
>> @@ -28,6 +28,7 @@
>>
>> #include <stdio.h>
>> #include <stdbool.h>
>> +#include <stddef.h>
>> #include <errno.h>
>> #include <unistd.h>
>> #include <stdlib.h>
>> @@ -39,6 +40,7 @@
>> #include <sys/stat.h>
>> #include <termios.h>
>> #include <fcntl.h>
>> +#include <linux/filter.h>
>>
>> #include "lib/bluetooth.h"
>> #include "lib/hci.h"
>> @@ -58,6 +60,7 @@
>> static struct btsnoop *btsnoop_file = NULL;
>> static bool hcidump_fallback = false;
>> static bool decode_control = true;
>> +static uint16_t filter_index = HCI_DEV_NONE;
>>
>> struct control_data {
>> uint16_t channel;
>> @@ -1028,6 +1031,31 @@ static int open_socket(uint16_t channel)
>> return fd;
>> }
>>
>> +static void attach_index_filter(int fd, uint16_t index)
>> +{
>> + struct sock_filter filters[] = {
>> + /* A <- MGMT index */
>> + BPF_STMT(BPF_LD + BPF_B + BPF_ABS,
>> + offsetof(struct mgmt_hdr, index)),
>> + /* A == HCI_DEV_NONE */
>> + BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, HCI_DEV_NONE, 0, 1),
>> + /* return */
>> + BPF_STMT(BPF_RET|BPF_K, 0x0fffffff), /* pass */
>> + /* A == index */
>> + BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, index, 0, 1),
>> + /* returns */
>> + BPF_STMT(BPF_RET|BPF_K, 0x0fffffff), /* pass */
>> + BPF_STMT(BPF_RET|BPF_K, 0), /* reject */
>> + };
>> + struct sock_fprog fprog = {
>> + .len = sizeof(filters) / sizeof(filters[0]),
>> + /* casting const away: */
>> + .filter = filters,
>> + };
>> +
>> + setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
>> +}
>> +
I would prefer a bit more comments on what the program is doing. So allow packets from HCI_DEV_NONE, filter for index etc.
Regards
Marcel
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
