freebsd-dev/usr.sbin/ifmcstat/ifmcstat.8
Bruce M Simpson 29dc7bc636 Merge final round of MLD changes from p4:
ip6_input.c, in6.h:
 * Add netinet6-specific mbuf flag M_RTALERT_MLD, shadowing M_PROTO6.
  * Always set this flag if HBH Router Alert option is present for MLD,
    even when not forwarding.

 icmp6.c:
 * In icmp6_input(), spell m->m_pkthdr.rcvif as ifp to be consistent.
 * Use scope ID for verifying input. Do not apply SSM filters here, no inpcb.
  * Check for M_RTALERT_MLD when validating MLD traffic, as we can't see
    IPv6 hop options outside of ip6_input().

 in6_mcast.c:
 * Use KAME scope/zone ID in in6_multi.
   * Update net.inet6.ip6.mcast.filters implementation to use scope IDs
     for comparisons.
 * Fix scope ID treatment in multicast socket option processing.
   Scope IDs passed in from userland will be ignored as other less
   ambiguous APIs exist for specifying the link.
 * Tighten userland input checks in IPv6 SSM delta and full-state ops.
   * Source filter embedded scope IDs need to be revisited, for now
     just clear them and ignore them on input.
 * Adapt KAME behaviour of looking up the scope ID in the default zone
   for multicast leaves, when the interface is ambiguous.

 mld6.c:
 * Tighten origin checks on MLD traffic as per RFC3810 Section 6.2:
  * ip6_src MAY be the unspecified address for MLDv1 reports.
  * ip6_src MAY have link-local address scope for MLDv1 reports,
    MLDv1 queries, and MLDv2 queries.
  * Perform address field validation *before* accepting queries.
 * Use KAME scope/zone ID in query/report processing.
   * Break const correctness for mld_v1_input_report(), mld_v1_input_query()
     as we temporarily modify the input mbuf chain.
   * Clear the scope ID before handoff to userland MLD daemon.
 * Fix MLDv1 old querier present timer processing.
   With the protocol defaults, hosts should revert to MLDv2 after 260s.
 * Add net.inet6.mld.v1enable sysctl, default to on.

 ifmcstat.c:
 * Use sysctl by default; -K requests kvm(3) if so compiled.

 mld.4:
 * Connect man page to build.

Tested using PCS.
2009-05-27 18:57:13 +00:00

132 lines
4.0 KiB
Groff

.\" $KAME: ifmcstat.8,v 1.6 2002/10/31 04:23:43 suz Exp $
.\"
.\" Copyright (c) 2007-2009 Bruce Simpson.
.\" Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
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.\" $FreeBSD$
.\"
.Dd May 27, 2009
.Dt IFMCSTAT 8
.Os
.Sh NAME
.Nm ifmcstat
.Nd dump multicast group management statistics per interface
.Sh SYNOPSIS
.Nm
.Op Fl i Ar interface
.Op Fl f Ar address-family
.Op Fl v
.Op Fl K
.Op Fl M Ar core
.Op Fl N Ar system
.\"
.Sh DESCRIPTION
The
.Nm
command dumps multicast group information from the kernel.
.Pp
The following options are supported:
.Bl -tag -width Fl
.It Fl i Ar interface
specifies the interface to be displayed.
.Pp
.It Fl f Ar address-family
specifies the address family to be displayed;
.Ar inet ,
.Ar inet6
and
.Ar link
are supported.
.It Fl v
specifies that link-layer memberships should be printed;
they are suppressed by default.
It may not be specified for
.Fl f Ar link .
Source lists for each group will also be printed.
.Pp
If specified twice, and
.Xr kvm 3
is in use, the control plane timers for each interface
and the source list counters for each group
will also be printed.
.El
.Pp
The following options are only available if
.Nm
has been built with support for
.Xr kvm 3 :
.Bl -tag -width Fl
.It Fl K
attempts to use
.Xr kvm 3
to retrieve the multicast group information.
.It Fl M Ar core
extracts values associated with the name list from the specified core,
instead of the default
.Pa /dev/kmem .
.It Fl N Ar system
extracts the name list from the specified kernel instead of the
default, which is the kernel image the system has booted from.
.El
.Sh IMPLEMENTATION NOTES
.Nm
will always print the embedded scope IDs of IPv6 multicast group
memberships.
This is because memberships are always scoped to an interface.
.Pp
When run with the
.Fl v
option,
.Nm
may print multicast MAC addresses twice if they are
referenced by a layer 3 protocol.
.Pp
When run with
.Xr kvm 3
support,
the names of all interfaces configured in the system will be
printed in the first column of output, even if no multicast
group memberships are present on those interfaces.
The output may also be slightly different, as the kernel
data structures are being traversed with minimal post-processing
of the output.
.Pp
When built without
.Xr kvm 3
support, the information displayed by
.Nm
is more limited.
This support is recommended for debugging purposes.
It requires super-user privilege if used to inspect a running kernel.
.Pp
.Sh SEE ALSO
.Xr getifaddrs 3 ,
.Xr getifmaddrs 3 ,
.Xr kvm 3 ,
.Xr netstat 8