K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2006-01-03T22:42:58.000000Z
K 7
svn:log
V 1632
Merge link layer mutlicast address list locking from HEAD to RELENG_5,
with a few changes to preserve ABI compatibility.

if_var.h:1.100:
  Add if_addr_mtx, a mutex to protect ifnet-related address lists.  Add
  accessor macros.

  Unlike FreeBSD 6 and HEAD, share a global mutex (instead of putting it
  in struct ifnet) to maintain ABI backwards compatibility.

if_var.h:1.101:
  - Rename ifmaof_ifpforaddr() to if_findmulti(); assert if_addr_mtx.
    Staticize.

if.c:1.239:
  Protect link layer network interface multicast address list manipulation
  using (global) if_addr_mtx:

  - Initialize if_addr_mtx in if_init().

  - Rename ifmaof_ifpforaddr() to if_findmulti(); assert if_addr_mtx.
    Staticize.

  - Extract ifmultiaddr allocation and initialization into if_allocmulti();
    accept a 'mflags' argument to indicate whether or not sleeping is
    permitted.  This centralizes error handling and address duplication.

  - Extract ifmultiaddr tear-down and deallocation in if_freemulti().

  - Re-structure if_addmulti() to hold if_addr_mtx around manipulation of
    the ifnet multicast address list and reference count manipulation.
    Make use of non-sleeping allocations.  Annotate the fact that we only
    generate routing socket events for explicit address addition, not
    implicit link layer address addition.

  - Re-structure if_delmulti() to hold if_addr_mtx around manipulation of
    the ifnet multicast address list and reference count manipulation.
    Annotate the lack of a routing socket event for implicit link layer
    address removal.

  - De-spl all and sundry.

Approved by:	rwatson (mentor)

END