0fb4154318
from HEAD to RELENG_6:
Rework IPX/SPX socket and pcb reference model:
- Introduce invariant that all IPX/SPX sockets will have valid so_pcb
pointers to ipxpcb structures, and that for SPX, the control block
pointer will always be valid. Don't attempt to free the socket or
pcb at various odd points, such as disconnect.
- Add a new ipxpcb flag, IPXP_DROPPED, which will be set in place of
freeing PCB's so that this invariant can be maintained. This flag
is now checked instead of a NULL check in various socket protocol
calls.
- Introduce many assertions that this invariant holds.
- Various pieces of code, such as the SPX timer code, no longer needs
to jump through hoops in case it frees a PCB while running.
- Break out ipx_pcbfree() from ipx_pcbdetach(). Likewise
spx_pcbdetach().
- Comment on some SMP-related limitations to the SPX code.
- Update copyrights.
$FreeBSD$ This protocol implements IPX/SPX over Ethernet_II frame type 0x8137. Please note: the SPX implementation may require further work and testing to insure proper operation. Mike Mitchell, Network Engineer AMTECH Systems Corporation, Technology and Manufacturing 8600 Jefferson Street, Albuquerque, New Mexico 87113 (505) 856-8000 supervisor@alb.asctmd.com John Hay Some Company Some Address jhay@mikom.csir.co.za Adapted for multi-processor, multi-threaded network stack by Robert N. M. Watson, Computer Laboratory, University of Cambridge. --- Copyright Information --- /*- Copyright (c) 1984, 1985, 1986, 1987, 1993 The Regents of the University of California. All rights reserved. Modifications Copyright (c) 1995, Mike Mitchell Modifications Copyright (c) 1995, John Hay Modifications Copyright (c) 2004-2006 Robert N. M. Watson */