obp/obp/pkg/netinet/inpcb.fth

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\ Hypervisor Software File: inpcb.fth
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id: @(#)inpcb.fth 1.1 04/09/07
purpose: Internet protocol control block representation
copyright: Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

\ An Internet Protocol Control Block (INPCB) is associated with each
\ socket. It holds information about local and remote endpoints for
\ this connection and pointers to the associated socket and protocol
\ specific control block structures.
\
\ TCP maintains state information for a connection in TCP Control
\ Blocks (TCBs). UDP maintains a queue of datagrams addressed to
\ the socket in UDP Control Blocks (UCBs).
\
\ All INPCBs for a particular protocol are held in doubly linked lists
\ maintained by that protocol.

headerless

struct
   /queue-entry  field  >in-pcblist     \ Doubly linked INPCB list
   /n            field  >in-socket      \ Back pointer to socket
   /n            field  >in-ppcb        \ Pointer to per-protocol PCB
   /ip-addr      field  >in-faddr       \ Remote IP, network byte ordered
   /w            field  >in-fport       \ Remote port, network byte ordered
   /ip-addr      field  >in-laddr       \ Local IP, network byte ordered
   /w            field  >in-lport       \ Local port, network byte ordered
constant /inpcb

: inpcb>so ( inpcb -- sockaddr )  >in-socket @ ;

: in-lport@ ( inpcb -- port )  >in-lport ntohw@ ;
: in-fport@ ( inpcb -- port )  >in-fport ntohw@ ;

\ Allocate an INPCB for a protocol.
: inpcb-alloc ( qhead -- inpcb )
   /inpcb dup alloc-mem tuck swap erase         ( qhead inpcb )
   tuck enqueue                                 ( inpcb )
;

\ Deallocate an INPCB.
: inpcb-free ( inpcb -- )
   dup remqueue                                 ( inpcb )
   /inpcb free-mem                              ( )
;

\ Bind local address and port number to a socket.
: inpcb-bind ( inpcb laddr lport -- )
   nip  over >in-lport htonw!   my-ip-addr swap >in-laddr copy-ip-addr
;

\ Record remote IP address and port number for a socket.
: inpcb-connect ( inpcb faddr fport -- )
   swap dup inaddr-any?  if  drop inaddr-broadcast  then
   rot  tuck >in-faddr copy-ip-addr  >in-fport htonw!
;

\ Disconnect from remote address and port number.
: inpcb-disconnect ( inpcb -- )
   0 over >in-fport htonw!  inaddr-any swap >in-faddr copy-ip-addr
;

\ Return local address and port number.
: in-getsockaddr ( inpcb insock -- )
   swap  dup >in-laddr  swap in-lport@  insock-init
;

\ Return foreign address and port number.
: in-getpeeraddr ( inpcb insock -- )
   swap  dup >in-faddr  swap in-fport@  insock-init
;

[ifdef] DEBUG
: .inpcb ( inpcb -- )
   dup >in-laddr .ipaddr  2 spaces  dup in-lport@ .d  2 spaces
   dup >in-faddr .ipaddr  2 spaces      in-fport@ .d  cr
;
[then]

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