xdpsock-ffi

C FFI bindings for xdpsock

Basic Usage

```

include

include

void* xsknew(); void* xskdelete(); void* xsksend(); void* xskrecv(); void* xsk_delete();

define MAXPKTSIZE 1500

int main() { char* ifname = "veth0"; void* xsk = xsk_new(ifname); sleep(5);

int i, j;
int pkts_to_recv = 10;
size_t len = 1500;

for(i = 0; i < pkts_to_recv; i++) {
    char buf[MAX_PKT_SIZE] = {0};
    xsk_recv(xsk, &buf, len);
    for(j = 0; j < MAX_PKT_SIZE; j++) {
        printf("0x%hhx,", buf[j]);
    }
    printf("\n");
}

char pkt_to_send[50] = {0x82, 0xff, 0x40, 0x35, 0x17, 0xa2, 0x9e, 0x4f,
                        0x30, 0x9e, 0xe1, 0x31, 0x08, 0x00, 0x45, 0x00,
                        0x00, 0x24, 0x00, 0x00, 0x40, 0x00, 0x14, 0x11,
                        0x5b, 0x75, 0xc0, 0xa8, 0x45, 0x01, 0xc0, 0xa8,
                        0x45, 0x02, 0x04, 0xd2, 0x10, 0xe1, 0x00, 0x10,
                        0xde, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                        0x00, 0x00};


for(i = 0; i < pkts_to_recv; i++) {
    xsk_send(xsk, &pkt_to_send, 50);
}

xsk_delete(xsk);
return 0;

} ```

For a more complicated example, see how AF_XDP is used to send packets in ZMap