RMB1

1
Data Rate Considerations

• Maximum through put is essential to the success
  of UDI protocols
• To achieve max throughput need to minimizing
  number of region transitions and blocking of
  flows caused by region serialization
• Plan to have separate NIC driver for region
  portability
• Network Service Provider (NSP) per network driver
  (or logical network driver)
• Multiplexes input to appropriate protocol
• Output goes through NSP to simplify network driver

2
Approach

• Initially the following Metalanguages will be
  developed. They will be combined where
  practical.
• Transport Interface Metalanguage
• Transport Listen channel for establishing
  connection
• Transport Connected or Unconnected Metalanguage
  for each connection

3
Approach (contd)

• Network Interface Metalanguage
• Unconnected or connected Network Interface
  Metalanguage
• Enables transport protocols to be added to a
  system relatively easily
• Transport protocols can bypass the Network
  Interface metalanguages
• Default path for protocols which bypass the
  network layer
• TCP can return RST and ICMP error
• UDP can return ICMP error
• Provides an interface to a raw socket
• ICMP
• IGMP
• OSPF daemon communications

4
Approach (contd)

• Forwarding/ARP database interface
• Routing daemons and monitor
• Protocols that bypass the network layer
• Routing daemons which interrogate and update
  forwarding tables
• Data link providers that store information to
  send data to their destination
• A forwarding structure
• Passed between the Forwarding/ARP database and
  its users
• Passed between Data Link Providers and Data Link
  Requesters
• Data Link structure is opaque to other modules
• There is an interface ID which uniquely
  identifies the Data Link Provider

5
Approach (contd)

• Data Link Metalanguage
• Unconnected
• There needs to be a way for a network or data
  link provider to connect to the data link
  provider.

6
TCP Listen Region

• 1 instance per listen port
• Responsibilities
• Queueing connection requests
• Notifies Transport Service Requester (TSR) of
  connect requests. TSR responsible for creating
  new channels for connection with the same
  attributes.
• Attributes
• Connection backlog
• Un-acked syns
• Un-accepted acked syns
• Un-acked syn limit
• Un-accepted acked syn limit
• send and recv buffer sizes for new connections
• actual send and recv buffer sizes

7
Transport Bind

• struct udi_cp_t gcb gcb udi_ubit32_t
  connection_id udi_td_bind_cb_t
• udi_td_bind_req ( udi_td_bind_cb_t cb,
  udi_index_t tx_chan_index, udi_index_t
  rx_chan_index)
• Default endpoint parameters (buffer size, window
  size, window scale factor, etc) need to be
  obtained from a shared database. If
  reader/writer locks are supported, this can be
  global data, otherwise it is the Port, IP, ARP
  database.
• Connection_id - used to match a connection
  request.

8
Transport Application Bind

• struct struct sockaddr bind_addr
  udi_td_appl_bind_cb_t
• udi_td_appl_bind_req ( udi_td_appl_bind_cb_t
  cb)
• udi_td_appl_bind_ack ( udi_td_appl_bind_cb_t
  )

9
Transport Connect

• struct udi_sockaddr_t connect_addr
  udi_td_create_connect_cb_t
• struct struct sockaddr connecting_addr
  udi_ubit32_t connection_id
  udi_tsr_rcvd_connect_cb_t
• udi_td_create_connect_req ( udi_td_create_conne
  ct_cb_t cb)
• udi_tsr_create_connect_ack (
  udi_td_create_connect_cb_t )
• udi_tsr_rcvd_connect_ind ( udi_tsr_rcvd_connect
  _cb_t)
• udi_td_rcvd_connect_res ( udi_tsr_rcvd_connect_
  cb_t)
• connection_id
• used to identify a connection when a bind request
  is later made.

10
Transport Transmit

• typedef struct udi_cb_t gcb
  udi_td_tx_cb_t chain udi_sockaddr_t
  dest_addr udi_buf_t tx_buf
  udi_boolean_t completion_urgent udi_boolean_t
  fail_if_no_buf udi_td_tx_cb_t
• udi_tsr_tx_rdy ( udi_td_tx_cb_t cb)
• udi_td_conn_tx_req ( udi_td_tx_cb_t cd)
• udi_td_tx_req ( udi_td_tx_cb_t cd)

11
Transport Transmit

• tx_buf
• This buffer contains the information needed to
  copy the request
• Also contains size of request
• This interface will not work with a 1.01
  environment
• Fail_if_no_buf
• Used to implement non-blocking I/O

12
Transport Receive

• typedef struct udi_cb_t gcb
  udi_td_tx_cb_t chain udi_buf_t rx_buf
  udi_ubit8_t rx_status udi_td_rx_cb_t
• udi_tsr_rx_ind ( udi_td_rx_cb_t cb)
• udi_td_rx_rdy ( udi_td_tx_cb_t cd)

13
Transport Option

• typedef struct udi_cb_t gcb
  udi_td_op_cb_t op void
  params udi_buf_t data_buf
  udi_td_opt_cb_t
• udi_tsr_rx_ind ( udi_td_opt_cb_t cb)
• udi_td_opt_ack ( udi_td_opt_cb_t cd)
• params
• Standard set for UDP, TCP, and other standard
  transport protocols
• Driver can specify a set for non standard
  protocols

14
Network Bind

• struct udi_cp_t gcb gcb
  udi_npd_bind_cb_t
• udi_npd_bind_req ( udi_npd_bind_cb_t cb,
  udi_index_t tx_chan_index, udi_index_t
  rx_chan_index)

15
Network Application Bind

• struct sockaddr sockaddr bind_addr
  udi_nd_appl_bind_cb_t
• udi_nd_appl_bind_req ( udi_nd_appl_bind_cb_t
  cb)
• udi_nd_appl_bind_ack ( udi_nd_appl_bind_cb_t )
• bind_addr
• Traditionally only the address is defined, port
  is not meaningful

16
Network Connect

• struct udi_sockaddr_t connect_addr
  udi_npd_create_connect_cb_t
• udi_npd_create_connect_req (
  udi_bpd_create_connect_cb_t cb)
• udi_npsr_create_connect_ack (
  udi_npd_create_connect_cb_t )
• connect_addr
• Traditionally only the address is defined, port
  is not meaningful

17
Network Transmit

• typedef struct udi_cb_t gcb
  udi_npd_tx_cb_t chain udi_sockaddr_t
  dest_addr udi_buf_t tx_buf
  udi_boolean_t completion_urgent
  udi_npd_tx_cb_t
• udi_npsr_tx_rdy ( udi_npd_tx_cb_t cb)
• udi_npd_conn_tx_req ( udi_npd_tx_cb_t cd)
• udi_npd_tx_req ( udi_npd_tx_cb_t cd)

18
Network Receive

• typedef struct udi_cb_t gcb
  udi_td_tx_cb_t chain udi_buf_t tx_buf
  udi_ubit8_t rx_status udi_npd_rx_cb_t
• udi_npsr_rx_ind ( udi_npd_rx_cb_t cb)
• udi_npd_rx_rdy ( udi_npd_tx_cb_t cd)

19
Network Option

• typedef struct udi_cb_t gcb
  udi_npd_op_cb_t op void
  params udi_buf_t data_buf
  udi_npd_opt_cb_t
• udi_npsr_npx_ind ( udi_npd_opt_cb_t cb)
• udi_npd_opt_ack ( udi_npd_opt_cb_t cd)
• params
• Indicates whether or not the caller is supplying
  the network protocol header

20
Forwarding Block

• typedef struct int dest_addr_size
  udi_sockaddr dest_addr int
  target_addr_size udi_sockaddr target_addr
  int dl_addr_size void dl_addr int
  dl_ifc_id udi_forwarding_block_t

21
Forwarding/ARP Bind

• struct udi_cp_t gcb gcb udi_fb_bind_cb_t
• udi_fb_bind_req ( udi_fbpd_bind_cb_t cb,
  udi_index_t tx_chan_index, udi_index_t
  rx_chan_index)

22
Forwarding/ARP Option

• typedef struct udi_cb_t gcb
  udi_npd_op_cb_t op udi_forwarding_block_t
  fdw_block udi_npd_opt_cb_t
• udi_npsr_npx_ind ( udi_npd_opt_cb_t cb)
• udi_npd_opt_ack ( udi_npd_opt_cb_t cd)
• op
• Read table
• Get entry
• Set entry

23
Data Link Bind

• struct udi_cp_t gcb gcb udi_dl_bind_cb_t
• udi_dl_bind_req ( udi_dl_bind_cb_t cb,
  udi_index_t tx_chan_index, udi_index_t
  rx_chan_index)

24
Data Link Transmit

• typedef struct udi_cb_t gcb
  udi_dl_tx_cb_t chain udi_sockaddr_t
  dest_addr udi_buf_t tx_buf
  udi_boolean_t completion_urgent
  udi_dl_tx_cb_t
• udi_dlsr_tx_rdy ( udi_dl_tx_cb_t cb)
• udi_dl_conn_tx_req ( udi_dl_tx_cb_t cd)
• udi_dl_tx_req ( udi_dl_tx_cb_t cd)

25
Data Link Receive

• typedef struct udi_cb_t gcb
  udi_td_tx_cb_t chain udi_buf_t tx_buf
  udi_ubit8_t rx_status udi_dl_rx_cb_t
• udi_dlsr_rx_ind ( udi_dl_rx_cb_t cb)
• udi_dl_rx_rdy ( udi_dl_tx_cb_t cd)

26
Data Link Option

• typedef struct udi_cb_t gcb
  udi_dl_op_cb_t op void
  params udi_buf_t data_buf
  udi_dl_opt_cb_t
• udi_dlsr_npx_ind ( udi_dl_opt_cb_t cb)
• udi_dl_opt_ack ( udi_dl_opt_cb_t cd)
• params

27
Mapping of UDI to TLI
28
Issues

• May need to define a region that can have
  multiple readers and one writer
• Can we get a timestamp
• Is the format appropriate
• How do all the connections get setup
• Is a network protocol module called a network
  driver or a network module?

29
Timestamp

• Used for TCP and UDP
• Also DoD uses it for tracking tragets
• TCP
• Monotonically increasing
• 1 msec to 1 sec tick
• 4 Bytes
• Sender and receiver do not need to be
  synchronized
• Timestamp is simply a serial number
• Conclusion TCP needs a timer anyway, the tick
  rate is such that it can be used to implement
  this serail number

30
TCP Timestamp (contd)

• UDP
• Routers add milliseconds past midnight UTC
• ICMP
• Requesting host and responding hosts use
  milliseconds past midnight UTC
• DoD clock
• Needs to be synchronized
• tick rate TBD
• 4 Bytes
• What happens if the platform is not capable of
  synchronizing its clock or does not know what to
  synchronize it with?
• Conclusion TBD

31
Socket Options

• Following apply to all protocols except where
  noted
• SO_DEBUG
• SO_DONTROUTE
• SO_ERROR (I think the protocols should report
  errors all the time and not use this)
• SO_KEEPALIVE (TCP only)
• SO_LINGER (TCP only)
• SO_OOBINLINE (TCP only)
• SO_RCVBUF and SO_SENDBUF
• SO_RCVLOWAT and SO_SNDLOWAT
• Send does not affect UDP
• SO_RCVTIMEO and SO_SNDTIMEO
• Not associated with protocols
• SO_REUSEADDR and SO_RESUEPORT
• TCP and UDP
• SO_USELOOPBACK
• IP only

32
IPv4 Socket Options

• IP_HDRINCL
• raw sockets for application protocols
• IP_OPTIONS
• used with higher level protocols to add options
  (e.g. source routing)
• IP_RECVDSTRADDR
• UDP receive of ancillary data
• IP_RECVIF
• interface index returned as ancillary data
• IP_TOS, IP_TTL
• set TOS, TTL associated with higher level
  protocol for a given socket

33
IPv6 Socket Options

• IPV6_ADDRFORM
• Enables IPv4/IPv6 address confersion
• ICMP6 _FILTER
• raw sockets
• IPV6_Checksum
• can supply a header that will be checksummed
• IPV6_DESTOPTS, IPV6_NOPLIMIT, IPV6_HOPOPTS,
  IPV6_PKTINFO, IPV6_RTHDR
• Enables return of ancillary data
• IPV6_PKTOPTIONS
• Used with TCP as well as UCP
• Sets ancillary data for future transmissions
• Can be used with TCP socket to receive ancillary
  data. (sendmsg(), recvmsg() do not work with
  TCP)
• IPV6_UNICAST_HOPS
• Sets hop limit for socket

34
TCP Socket Options

• TCP_KEEPALIVE
• Changes keepalive time
• TCP_MAXRT
• Time before a connection is broken once
  retransmission begins
• TCP_MAXSEG
• TCP_NODELAY
• TCP_STDURG

35
Multicast Socket Options

• IP_ADD_MEMBERSHIP IPV6_ADD_MEMBERSHIP
• IP_DROP_MEMBERSHIP IPV6_DROP_MEMBERSHIP
• IP_MULTICAST_IF IPV6_MULTICAST_IF
• IP_MULTICAST_TTL IPV6_MULTICAST_HOPS
• IP_MULTICAST_LOOP IPV6_MULTICAST_LOOP