// Get the next packet
UINT VLanPaGetNextPacket(SESSION *s, void **data)
{
VLAN *v;
UINT size;
// Validate arguments
if (data == NULL || (s == NULL) || ((v = s->PacketAdapter->Param) == NULL))
{
return INFINITE;
}
if (VLanGetNextPacket(v, data, &size) == false)
{
return INFINITE;
}
return size;
}
UINT EthGetPacketLinux(ETH *e, void **data)
{
int s, ret;
UCHAR tmp[UNIX_ETH_TMP_BUFFER_SIZE];
// Validate arguments
if (e == NULL || data == NULL)
{
return INFINITE;
}
if (e->Tap != NULL)
{
#ifndef NO_VLAN
// tap mode
void *buf;
UINT size;
if (VLanGetNextPacket(e->Tap, &buf, &size) == false)
{
return INFINITE;
}
*data = buf;
return size;
#else // NO_VLAN
return INFINITE;
#endif
}
s = e->Socket;
if (s == INVALID_SOCKET)
{
return INFINITE;
}
// Read
ret = read(s, tmp, sizeof(tmp));
if (ret == 0 || (ret == -1 && errno == EAGAIN))
{
// No packet
*data = NULL;
return 0;
}
else if (ret == -1 || ret > sizeof(tmp))
{
// Error
*data = NULL;
e->Socket = INVALID_SOCKET;
return INFINITE;
}
else
{
// Success to read a packet
*data = MallocFast(ret);
Copy(*data, tmp, ret);
return ret;
}
return 0;
}
UINT EthGetPacketLinux(ETH *e, void **data)
{
int s, ret;
UCHAR tmp[UNIX_ETH_TMP_BUFFER_SIZE];
// 引数チェック
if (e == NULL || data == NULL)
{
return INFINITE;
}
if (e->Tap != NULL)
{
#ifndef NO_VLAN
// tap モード
void *buf;
UINT size;
if (VLanGetNextPacket(e->Tap, &buf, &size) == false)
{
return INFINITE;
}
*data = buf;
return size;
#else // NO_VLAN
return INFINITE;
#endif
}
s = e->Socket;
if (s == INVALID_SOCKET)
{
return INFINITE;
}
// 読み込み
ret = read(s, tmp, sizeof(tmp));
if (ret == 0 || (ret == -1 && errno == EAGAIN))
{
// パケット無し
*data = NULL;
return 0;
}
else if (ret == -1 || ret > sizeof(tmp))
{
// エラー
*data = NULL;
e->Socket = INVALID_SOCKET;
return INFINITE;
}
else
{
// パケット読み込み成功
*data = MallocFast(ret);
Copy(*data, tmp, ret);
return ret;
}
return 0;
}
UINT EthGetPacketLinux(ETH *e, void **data)
{
int s, ret;
UCHAR tmp[UNIX_ETH_TMP_BUFFER_SIZE];
struct iovec msg_iov;
struct msghdr msg_header;
struct cmsghdr *cmsg;
union
{
struct cmsghdr cmsg;
char buf[CMSG_SPACE(sizeof(struct my_tpacket_auxdata))];
} cmsg_buf;
// Validate arguments
if (e == NULL || data == NULL)
{
return INFINITE;
}
if (e->Tap != NULL)
{
#ifndef NO_VLAN
// tap mode
void *buf;
UINT size;
if (VLanGetNextPacket(e->Tap, &buf, &size) == false)
{
return INFINITE;
}
*data = buf;
return size;
#else // NO_VLAN
return INFINITE;
#endif
}
s = e->Socket;
if (s == INVALID_SOCKET)
{
return INFINITE;
}
// Read
msg_iov.iov_base = tmp;
msg_iov.iov_len = sizeof(tmp);
msg_header.msg_name = NULL;
msg_header.msg_namelen = 0;
msg_header.msg_iov = &msg_iov;
msg_header.msg_iovlen = 1;
if (e->Linux_IsAuxDataSupported)
{
memset(&cmsg_buf, 0, sizeof(cmsg_buf));
msg_header.msg_control = &cmsg_buf;
msg_header.msg_controllen = sizeof(cmsg_buf);
}
else
{
msg_header.msg_control = NULL;
msg_header.msg_controllen = 0;
}
msg_header.msg_flags = 0;
ret = recvmsg(s, &msg_header, 0);
if (ret == 0 || (ret == -1 && errno == EAGAIN))
{
// No packet
*data = NULL;
return 0;
}
else if (ret == -1 || ret > sizeof(tmp))
{
// Error
*data = NULL;
e->Socket = INVALID_SOCKET;
return INFINITE;
}
else
{
bool flag = false;
USHORT api_vlan_id = 0;
USHORT api_vlan_tpid = 0;
if (e->Linux_IsAuxDataSupported)
{
for (cmsg = CMSG_FIRSTHDR(&msg_header); cmsg; cmsg = CMSG_NXTHDR(&msg_header, cmsg))
{
struct my_tpacket_auxdata *aux;
UINT len;
USHORT vlan_tpid = 0x8100;
USHORT vlan_id = 0;
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct my_tpacket_auxdata)) ||
cmsg->cmsg_level != SOL_PACKET ||
cmsg->cmsg_type != MY_PACKET_AUXDATA)
{
continue;
}
aux = (struct my_tpacket_auxdata *)CMSG_DATA(cmsg);
if (aux != NULL)
{
if (aux->tp_vlan_tci != 0)
{
vlan_id = aux->tp_vlan_tci;
}
}
if (vlan_id != 0)
{
api_vlan_id = vlan_id;
api_vlan_tpid = vlan_tpid;
break;
}
}
if (api_vlan_id != 0 && api_vlan_tpid != 0)
{
// VLAN ID has been received with PACKET_AUXDATA.
// Insert the tag.
USHORT vlan_id_ne = Endian16(api_vlan_id);
USHORT vlan_tpid_ne = Endian16(api_vlan_tpid);
if (ret >= 14)
{
if (*((USHORT *)(tmp + 12)) != vlan_tpid_ne)
{
*data = MallocFast(ret + 4);
Copy(*data, tmp, 12);
Copy(((UCHAR *)*data) + 12, &vlan_tpid_ne, 2);
Copy(((UCHAR *)*data) + 14, &vlan_id_ne, 2);
Copy(((UCHAR *)*data) + 16, tmp + 12, ret - 12);
flag = true;
ret += 4;
}
}
}
}
// Success to read a packet (No VLAN)
if (flag == false)
{
*data = MallocFast(ret);
Copy(*data, tmp, ret);
}
return ret;
}
return 0;
}