static int start_instance(AFPacket_Context_t *afpc, AFPacketInstance *instance)
{
struct packet_mreq mr;
int arptype;
/* Bind the RX ring to this interface. */
if (bind_instance_interface(afpc, instance) != 0)
return -1;
/* Turn on promiscuous mode for the device. */
memset(&mr, 0, sizeof(mr));
mr.mr_ifindex = instance->index;
mr.mr_type = PACKET_MR_PROMISC;
if (setsockopt(instance->fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mr, sizeof(mr)) == -1)
{
DPE(afpc->errbuf, "%s: setsockopt: %s", __FUNCTION__, strerror(errno));
return -1;
}
/* Get the link-layer type. */
arptype = iface_get_arptype(instance);
if (arptype < 0)
{
DPE(afpc->errbuf, "%s: failed to get interface type for device %s: (%d) %s",
__FUNCTION__, instance->name, errno, strerror(errno));
return -1;
}
if (arptype != ARPHRD_ETHER)
{
DPE(afpc->errbuf, "%s: invalid interface type for device %s: %d != %d",
__FUNCTION__, instance->name, arptype, ARPHRD_ETHER);
return -1;
}
/* Determine which versions of TPACKET the socket supports. */
if (determine_version(afpc, instance) != DAQ_SUCCESS)
return -1;
/* Request the kernel RX ring from af_packet... */
if (create_ring(afpc, instance, &instance->rx_ring, PACKET_RX_RING) != DAQ_SUCCESS)
return -1;
/* ...request the kernel TX ring from af_packet if we're in inline mode... */
if (instance->peer && create_ring(afpc, instance, &instance->tx_ring, PACKET_TX_RING) != DAQ_SUCCESS)
return -1;
/* ...map the memory for the kernel ring(s) into userspace... */
if (mmap_rings(afpc, instance) != DAQ_SUCCESS)
return -1;
/* ...and, finally, set up a userspace ring buffer to represent the kernel RX ring... */
if (set_up_ring(afpc, instance, &instance->rx_ring) != DAQ_SUCCESS)
return -1;
/* ...as well as one for the TX ring if we're in inline mode. */
if (instance->peer && set_up_ring(afpc, instance, &instance->tx_ring) != DAQ_SUCCESS)
return -1;
return 0;
}
static int start_instance(AFPacket_Context_t *afpc, AFPacketInstance *instance)
{
struct packet_mreq mr;
int arptype;
/* Bind to the specified device so we only see packets from it. */
if (bind_interface(afpc, instance) != 0)
return -1;
/* Turn on promiscuous mode for the device. */
memset(&mr, 0, sizeof(mr));
mr.mr_ifindex = instance->index;
mr.mr_type = PACKET_MR_PROMISC;
if (setsockopt(instance->fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mr, sizeof(mr)) == -1)
{
DPE(afpc->errbuf, "%s: setsockopt: %s", __FUNCTION__, strerror(errno));
return -1;
}
/* Get the link-layer type. */
arptype = iface_get_arptype(instance);
if (arptype < 0)
{
DPE(afpc->errbuf, "%s: failed to get interface type for device %s: (%d) %s",
__FUNCTION__, instance->name, errno, strerror(errno));
return -1;
}
if (arptype != ARPHRD_ETHER)
{
DPE(afpc->errbuf, "%s: invalid interface type for device %s: %d != %d",
__FUNCTION__, instance->name, arptype, ARPHRD_ETHER);
return -1;
}
/* Determine which versions of TPACKET the socket supports. */
if (determine_version(afpc, instance) != DAQ_SUCCESS)
return -1;
if (afpc->debug)
{
printf("Version: %u\n", instance->tp_version);
printf("Header Length: %u\n", instance->tp_hdrlen);
}
if (create_rx_ring(afpc, instance) != DAQ_SUCCESS)
return -1;
if (set_up_rx_ring(afpc, instance) != DAQ_SUCCESS)
return -1;
return 0;
}
